Reference

Hugh A.H. Jansman, Albertus T.C. Bosveld, Barbara C. van Dam, Freek J.J. Niewold (2001): Genetic and hormonal monitoring of otters Lutra lutra by analysis from spraints. (N.F. 436) – Wissenschaftliche Mitteilungen Niederösterreichisches Landesmuseum – 14: 129 - 130.