1. Effect of diet on the clearance of estradiol-17-beta in the ewe;Adams;Biol Reprod,1994
2. Control system for detection of the illegal use of naturally occurring steroids in calves;Arts;J Chromatogr, Biomed Appl,1991
3. Estrogen determination in feces for the pregnancy diagnosis in the horse, cow, pig, sheep and goats;Bamberg;Tierarztl Umsch,1986
4. Source and environmental fate of natural oestrogens;Blok,2000
5. Pesticides in run-off and surface waters;Burgoa,1995