1. The feral hog on the Dye Creek Ranch, California;Barrett;Hilgardia,1978
2. Ethology in environmental design for animal production;Baxter;Appl. Anim. Ethol.,1983
3. Captivity and feralization;Boice;Psychol. Bull.,1981
4. Ermittlungen zur Aktivitätsperiodik des mitteleuropaischen Wildschweines (Sus s. scrofa L.);Briedermann;Zool. Gart. N.F. Leipzig,1971
5. Actogramme journalier de l'hylochère (Hylochoerus meinertzhageni thomas) au parc national des Virunga, Zaïre;D'Huart;Terre Vie,1976