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Issa, Y. M., F. A. M. Attia, O. E. Sherif, and A. A. S. Dena, "Potentiometric and surface topography studies of new carbon-paste sensors for determination of thiamine in Egyptian multivitamin ampoules", Arabian Journal of Chemistry, vol. 10, pp. 751–760, 2017.
Issa, Y. M., M. E. M. Hassoun, and A. G. Zayed, "APPLICATION OF HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC METHOD FOR THE DETERMINATION OF LEVODOPA, CARBIDOPA, AND ENTACAPONE IN TABLET DOSAGE FORMS", Journal of Liquid Chromatography & Related Technologies, vol. 34, pp. 2433–2447, 2011. Abstract
Issa, Y. M., Hussein M. Abdel-Fattah, and N. B. Abdel-Moniem, "Chemically Modified Carbon Paste Sensors for Micro-Determination of Doxycycline Based on Heteropolyacids", Literati Journal of Pharmaceutical Drug Delivery Technologies, vol. 2, issue 1, pp. 13-21, 2016.
Issa, Y. M., G. Abdel-Maksoud, and M. Magdy, "Analytical Study of Saint Gregory Nazianzen Icon, Old Cairo, Egypt", J. Mol. Struc, vol. 1100, pp. 70-79, 2015.
Issa, Y. M., H. Ibrahim, and O. R. Shehab, "New Copper (II)-selective chemically modified carbon paste electrode based on etioporphyrin I dihydrobromide", Journal of electroanalytical Chemistry, vol. 666, pp. 11-18, 2012.
Issa, Y. M., S. A. Abdel-Latif, S. M. Abn-el-Wafa, and H. A. Abdel-Salam, "Synthesis and Characterization of Cu(II) Complexes with New Mandelic Hydrazones", Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, vol. 29, pp. 53–71, 1999. Abstract
Issa, Y. M., and A. S. Amin, "Spectrophotometric assay of cephalosporins in pharmaceutical products, using chromotrope 2B and chromotrope 2R", Mikrochimica Acta, vol. 124, pp. 203–209, 1996. Abstract
Issa, Y. M., G. Abdel-Maksoud, M. Ibrahim, and M. Magdy, "A combination of analytical methods to evaluate the effect of humidity aging on the painting materials of icon models", J. Vib. Spec., , vol. 107, pp. 103010, 2020.
Issa, R. M., A. M. Hindawey, Y. M. Issa, and F. M. Issa, "Polarographic study of solochrome violet RS in buffer solutions in absence and presence of surface active substances (SAS)", Monatshefte Fur Chemie, vol. 109, pp. 961–973, 1978. Abstract
Issa, Y. M., M. M. Khalil, S. I. M. Zayed, and A. Hussein, "Flow injection potentiometric sensor for determination of phenylpropanolamine hydrochloride", Arabian Journal of Chemistry, vol. 2, pp. 41–46, 2009. Abstract
Issa, Y. M., and S. A. Abdel-Latif, "ChemInform Abstract: Spectroscopic Studies on Some Hydroxy-nitrosocoumarins", Cheminform, vol. 29, 2010. Abstract
Issa, Y. M., E. A. L. Ansary, O. E. Sherif, and H. B. Hassib, "Charge–transfer complexes of pyrimidine Schiff bases with aromatic nitro compounds", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 79, no. 3, pp. 513 - 521, 2011. AbstractWebsite

Charge–transfer (CT) complexes of pyrimidine Schiff bases, derived from condensation of 2-aminopyrimidine and substituted benzaldehydes, with some aromatic polynitro compounds were prepared and investigated using IR, UV, visible and 1H \{NMR\} spectroscopy. For all solid complexes, the main interaction between the donor and acceptor molecules takes place through the π–π* interaction. Strong and some weak acidic acceptors, in addition interact through proton transfer from the acceptor molecule to the basic centre of the electron donor. Also, an n–π* transition was detected in some complexes.

Issa, Y. M., Sayed A. Ahmed, N. S. Mohamed, and N. M. Mohamed, "The Construction and Performance Characteristics of Carbon Paste Electrodes for Oxomemazine Hydrochloride", Amer. J. App. Ind. Chem.,, vol. 2, issue 2, pp. 10-17, 2016.
Issa, Y. M., A. A. Salem, and M. S. Bahbouh, "Charge Transfer Complex Formation in Spectrophotometric Determination of Verapamil Hydrochloride", Analytical Letters, vol. 30, pp. 1153–1166, 1997. Abstract
Issa, M. Y., M. F. Elshal, N. Fathallah, M. A. Abdelkawy, M. Bishr, O. Salama, and Y. S. Abulfadl, "Potential Anticancer Activity of the Furanocoumarin Derivative Xanthotoxin Isolated from Ammi majus L. Fruits: In Vitro and In Silico Studies", molecules, vol. 27, pp. 1-16, 2022.
Issa, Y. M., A. F. Shoukry, and R. M. El-Nashar, "Conductimetric determination of reproterol HCl and pipazethate HCl and salbutamol sulphate in their pharmaceutical formulations", Journal of pharmaceutical and biomedical analysis, vol. 26, no. 3: Elsevier, pp. 379–386, 2001. Abstract
Issa, Y. M., H. A. M. Fattah, O. R. Shehab, and N. A. B. Moniem, "Determination and Speciation of Tellurium Hazardous Species in Real and Environmental Samples", international Journal of Electrochemical Science, vol. 11, pp. 7475-7498, 2016.
Issa, Y. M., E. M. Hussien, M. M. Ibrahim, F. M. Abdel-Gawad, and S. Barakat, "Spectrophotometric Determination of Carvedilol in Tablets by Charge-transfer and Ion-Pair Complexation Reaction", I. J. D. T., vol. 3(2), pp. 131-147 , 2012.
Issa, Y. M., W. F. El-Hawary, A. F. A. Youssef, and A. R. Senosy, "Spectrophotometric determination of sildenafil citrate in pure form and in pharmaceutical formulation using some chromotropic acid azo dyes", Spectrochimica Acta Part A-molecular and Biomolecular Spectroscopy, 2010. Abstract
Issa, Y. M., H. B. Hassib, H. E. Abdelaal, and I. M. Kenawi, "Spectral investigation of the intramolecular charge-transfer in some aminotriazole Schiff bases", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 79, no. 5, pp. 1364 - 1374, 2011. AbstractWebsite

3-Amino-1,2,4-triazole Schiff bases were reported to contain intramolecular charge-transfer. The enhancing and depressing effects were remarkable as the substituent was changed from electron-donating to electron-withdrawing groups. The path of the resonating delocalization was reversed in the case of the p-NO2 group. To validate these results we effectively used Weinhold et al's natural bond orbital analysis to assess the \{UV\} and FT-IR spectrophotometric monitoring of the change reflected in this phenomenon when the substituent in the benzene ring is altered. The \{NBO\} analysis was simulated by ab inito computations at the HF/6-31G(d) level of theory, in order to properly detect any possible presence of a hydrogen bond association. The changes occurring in electron occupancies of double-centered bonds, antibonding orbitals and in lone-pair orbitals appraised the results, as did the s and p character listings of the two-centered bonds and the simultaneous changes occurring in the geometric parameters of the molecules in question. Contrary to its normal preference, in these molecules the nitrogen used sp2 hybrid orbitals for its interaction, housing its electron lone-pair in the third p hybrid orbital. Furthermore, \{NBO\} analysis reflected the presence of a very soft intramolecular hydrogen association (C–H⋯π), labelled by \{UV\} and FT-IR assignments, between the benzene and triazole rings in all Schiff bases but p-N(Me)2. The n–π* stabilization energy decreased in the order: p-OH > p-OCH3 > p-Cl > p-CH3 > H > p-NO2 > o-OH. The relation between the band position and Hammett substitution constant is interpreted in relation to the molecular structure.

Issa, Y. M., W. H. Hegazy, W. N. El-Sayed, and H. I. Ahmed, "Pantoprazole Sodium Sesquihydrate Complexes: Synthesis, Characterization, Potentiometric Determination and DNA interaction", Oriental J. Chem., vol. 32, issue 2, pp. 1085-1097, 2016.
Issa, Y., T. V. Macfarlane, P. A. Brunton, and A. J. Duxbury, "Oral lichenoid lesions related to dental restorative materials", British Dental Journal, vol. 198, pp. 361–366, 2005. Abstract
Issa, Y. M., A. F. Shoukry, and R. M. El-Nashar, "Conductimetric determination of reproterol HCl and pipazethate HCl and salbutamol sulphate in their pharmaceutical formulations", Journal of Pharmaceutical and Biomedical Analysis, vol. 26, pp. 379–386, 2001. Abstract
Issa, Y. M., O. E. Sherif, and S. M. Abbas, "Chelation Behaviour of Ce(III), Th(IV), and UO 2 (VI) with 5,7-Dihydroxy-6-formyl-2-methylbenzopyran-4-one Schiff Bases", Monatshefte Fur Chemie, vol. 129, pp. 985–998, 1998. Abstract