المؤلفون: Ressang, A. A., Mastenbroek, Nel, Quak, J., Griensven, L. J. L. D., Calafat, Jero, Hilgers, J., Hageman, Philomena C., Souissi, T., Swen, Sietske

المصدر: Zentralblatt für Veterinärmedizin Reihe B ; volume 21, issue 8, page 602-617 ; ISSN 0931-2021

الاتاحة: http://dx.doi.org/10.1111/j.1439-0450.1974.tb00535.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1439-0450.1974.tb00535.x
http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1439-0450.1974.tb00535.x/fullpdf