Literaturrecherche

Literatur Ladewig J, De Passillè AM, Schouten W, Terlouw C, Vorell E von (1993) Stress and the physiological correlates of stereotypic behavior. In: Lawrence AB, Rushen J (eds) Stereotypic animal behaviour : fundamentals and applications to welfare. Wallingford: CAB International

Literatur Baader W (1991) Biological waste treatment. In: Matthews J (ed) Progress in agricultural physics and engineering. Wallingford: CAB International, pp 305-327