El Nino: effects of environmental stress on pinniped populations
In: Stress - auf allen Ebenen, Jg. 6, S. 103 ff.1992
Senescence and costs of reproduction in the life history of a small precocial species
In: Ecology and Evolution, Jg. 9 H. 12, S. 7069-70792019Spatial proximity and mate-specific behaviour in a flock of budgerigars (Melopsittacus undulatus; Aves, Psittacidae)
In: Zeitschrift für Tierpsychologie, Jg. 41, S. 307-3311976