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Prinzinger, R; Siedle, K «Ontogeny of metabolism, thermoregulation and torpor in the house martin Delichon u. urbica (L.) and its ecological significance». Oecologia, 76, 2, 1988, pàg. 307–312. Bibcode: 1988Oecol..76..307P. DOI: 10.1007/BF00379969. PMID: 28312213.
Prinzinger, R; Siedle, K «Ontogeny of metabolism, thermoregulation and torpor in the house martin Delichon u. urbica (L.) and its ecological significance». Oecologia, 76, 2, 1988, pàg. 307–312. Bibcode: 1988Oecol..76..307P. DOI: 10.1007/BF00379969. PMID: 28312213.