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Kolliker, Mathias; Brinkhof, Martin W.G.; Heeb, Philipp; Fitze, Patrick S.; Richner, Heinz (2000). The quantitative genetic basis of offspring solicitation and parental response in a passerine bird with biparental care. Proceedings of the Royal Society. Series B - biological sciences, 267(1457), pp. 2127-2132. London: Royal Society of London 10.1098/rspb.2000.1259
Kölliker, Mathias; Heeb, Philipp; Werner, Isabelle; Mateman, A. C.; Lessells, C. M.; Richner, Heinz (1999). Offspring sex ratio is related to male body size in the great tit (Parus major). Behavioral Ecology, 10(1), pp. 68-72. Oxford University Press 10.1093/beheco/10.1.68
Richner, Heinz; Heeb, Philipp (1996). Communal life: honest signaling and the recruitment center hypothesis. Behavioral Ecology, 7(1), pp. 115-118. Oxford University Press 10.1093/beheco/7.1.115