Pfister, Patrizia; Kaufmann, Thomas; Fellay, E.; Hirsbrunner, Gabriela (2011). [Reproductive performance in Herens cows from 2003 to 2007]. Schweizer Archiv für Tierheilkunde, 153(1), pp. 7-13. Bern: Huber 10.1024/0036-7281/a000136
