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deCarvalho M, Anderson DM, Giangreco A, Pittard WB (May 1985). "Frequency of milk expression and milk production by mothers of nonnursing premature neonates". American Journal of Diseases of Children. 139 (5): 483–485. doi:10.1001/archpedi.1985.02140070057033. PMID3984973.
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Oftedal OT (July 2002). "The mammary gland and its origin during synapsid evolution". Journal of Mammary Gland Biology and Neoplasia. 7 (3): 225–252. doi:10.1023/A:1022896515287. PMID12751889. S2CID25806501.
Oftedal OT (July 2002). "The origin of lactation as a water source for parchment-shelled eggs". Journal of Mammary Gland Biology and Neoplasia. 7 (3): 253–266. doi:10.1023/A:1022848632125. PMID12751890. S2CID8319185.
Khong HK, Kuah MK, Jaya-Ram A, Shu-Chien AC (May 2009). "Prolactin receptor mRNA is upregulated in discus fish (Symphysodon aequifasciata) skin during parental phase". Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology. 153 (1): 18–28. doi:10.1016/j.cbpb.2009.01.005. PMID19272315.
Williford A, Stay B, Bhattacharya D (2004). "Evolution of a novel function: nutritive milk in the viviparous cockroach, Diploptera punctata". Evolution & Development. 6 (2): 67–77. doi:10.1111/j.1525-142x.2004.04012.x. PMID15009119. S2CID31048064.
Oftedal OT (July 2002). "The mammary gland and its origin during synapsid evolution". Journal of Mammary Gland Biology and Neoplasia. 7 (3): 225–252. doi:10.1023/A:1022896515287. PMID12751889. S2CID25806501.
Oftedal OT (July 2002). "The origin of lactation as a water source for parchment-shelled eggs". Journal of Mammary Gland Biology and Neoplasia. 7 (3): 253–266. doi:10.1023/A:1022848632125. PMID12751890. S2CID8319185.
Williford A, Stay B, Bhattacharya D (2004). "Evolution of a novel function: nutritive milk in the viviparous cockroach, Diploptera punctata". Evolution & Development. 6 (2): 67–77. doi:10.1111/j.1525-142x.2004.04012.x. PMID15009119. S2CID31048064.