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Author Title Year Publication Serial Volume Pages
Ruckebusch Y, The hypnogram as an index of adaptation of farm animals to changes in their environment 1975 1531 2 3-18
RUCKEBUSCH Y et al, Les états de sommeil chez le cheval 1970 1532 658 665
Ryder O, The quagga is gone but its genes may survive 1983 1536 16
RYDER OA et al, Chromosome banding studies of the equidae 1978 1538 20 323-350
Rzasnicki A, Beobachtungen an Chapman – Zebras 1933 Zoologische Garten 1541 6 1-10
Rzasnicki A, Ein wildpferdfarbiges Shetlandponyfohlen 1934 Zoologische Garten 1542 7 89-92
Rzasnicki A, Zur Kenntnis und zur Entdeckungsgeschichte des Grevy – Zebras 1936 Zoologische Garten 1543 8 283-291
Rzasnicki A, Ein Maulesel im Warschauer Zoo 1939 Zoologische Garten 1544 10; 202 207
Rzasnicki A Py, Complete list of the specimens of skeletons and skins of Equus quagga quagga preseved in the museum of the whole world in 1939 1545 14 69-73
Rzasnicki A, Zebras and quaggas 1951 1546 16 203-252