@article {28292,
	title = {Studies on the effieciency of absorbed bovine PPD in tuberculin and serological tests.},
	journal = { J. Vet. Med. B. },
	volume = {36, },
	year = {1989},
	pages = {175-179 },
	attachments = {https://scholar.cu.edu.eg/sites/default/files/hanem/files/studies_on_the_efficiency_of_absorbed_bovine_ppd.pdf},
	author = {Hammam, H., and Refai, M., and Bisping, W and Kirpal, G. :}
}
