Reference

Sabine Kleinknecht, Hans G. Erkert, John E. Nelson (1984): Circadian and ultradian rhythms of activity and O2-consumption in three nocturnal Marsupialian species: Petaurus breviceps, Phalangeridae; Dasyuroides byrnei, Dasyuridae; Monodelphis domestica, Didelphidae – Mammalian Biology (früher Zeitschrift für Säugetierkunde) – 50: 321 - 329.