1. 1. OMIA .Online Mendelian inheritance in animals. Department of Animal Science University of Sydney. World Wide WebURL:http/www.angis.org.au/Database/BIRX/omia.
2. 3. KT Szabo . Congenital malformation in laboratory and farm animals , Academic Press, San Diego, 1988 :169 .
3. 4VA McKusick . Mendelian inheritance in man . 11th edn. John Hopkins University Press, Baltimore, 1994 :9 .