Nager, Ruedi G.; Monaghan, Pat; Houston, David C.; Genovart, Meritxell (2000). "Parental Condition, Brood Sex Ratio and Differential Young Survival: An Experimental Study in Gulls (Larus fuscus)". Behavioral Ecology and Sociobiology. 48 (6): 452–457. doi:10.1007/s002650000262. JSTOR4601840. S2CID42967.
Nager, Ruedi G.; Monaghan, Pat; Houston, David C.; Genovart, Meritxell (2000). "Parental Condition, Brood Sex Ratio and Differential Young Survival: An Experimental Study in Gulls (Larus fuscus)". Behavioral Ecology and Sociobiology. 48 (6): 452–457. doi:10.1007/s002650000262. JSTOR4601840. S2CID42967.
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Nager, Ruedi G.; Monaghan, Pat; Houston, David C.; Genovart, Meritxell (2000). "Parental Condition, Brood Sex Ratio and Differential Young Survival: An Experimental Study in Gulls (Larus fuscus)". Behavioral Ecology and Sociobiology. 48 (6): 452–457. doi:10.1007/s002650000262. JSTOR4601840. S2CID42967.