1. Zwillings- und Drillingsuntersuchungen beim Rind, unter besonderer Berücksichtigung der Skelettvariabilität;Belič;Z. Tierzüchtg., Züchtgsbiol.,1941
2. Twinning in cattle;Hewitt;J. Dairy Res.,1934
3. The sex-ratio and multiple births in cattle;Johansson;Z. Tierzüchtg., Züchtgs.-biol.,1932
4. The relation of age of dam to observed fecundity in domesticated animals. 1. Multiple births in cattle and sheep;Jones;J. Dairy Sci.,1920
5. Mnogoplodie bestuževskoi porody krupnogo rogatogo skota;Ljutikov;Vestn. Životn.,1946