S. S. Mochalov, T. P. Surikova, F. M. Abdelrazek, V. D. Zakharova, and Y. S. Shabarov,
"Ipso attack in the nitration of 5-bromo-and 5-methyl-2-cyclopropyl-thiophenes.",
Khim. Geterotsikl. Soedin., vol. 2, issue ----, pp. 189-193, 1981.
Khalil, E. E., and M. M. Kamel,
"Modern Diagnostic Techniques in Combustion Research ",
World Congress on Chemical Engineering, Montreal, , vol. 1, issue 1, pp. 188-192, 1981.
Al-Hussaini, E. K., and A. F. Hassan,
"Modified adaptive nonparametric detectors for weak signals in noise",
Sixth International Congress for Statistics,Computer Science,Social and Demographic Research,Ain-Shams University, Cairo,Egypt, Ain-Shams University, pp. 289-307, 1981.