Abt, D.A., Croshaw, J.E., Hare, W.C.D. (1962) Monocephalus dipygus parasiticus and other anomalies in a calf. JAVMA. 141: 1068–1072.
Aine, M.S. (2009) Monocephalus dipygus parapagus: a suspected case of complete caudal duplication in a British Blue kitten. J Feline Med Surg. 11: 330-331.
Antoine, D., Murugavel, K., Alphonse, R.M.D., Ramalingam, S., Thandavamurthy, C. (1997) Monocephalus dipygus monster in a buffalo—a case report. Indian J Anim Reprod. 18: 166.
Bannykh, S.I., Bannykh, G.I., Mannino, FL., Jones, KL., Hansen, L., Benirschke, K., Masliah, E. (2001) Partial caudal duplication in a Newborn associated with meningomyelocele and complex heart anomaly. Teratology. 63: 94–99.
Buhari, S., Yakubu, A.S., Jibril, A., Adeyanju, J.B., Chafe, U.M. (2008) Monocephalus, thoracopagus and dipygus twins in Sokoto Red goat. Sokoto J Vet Sci. 7: 23-24.
Corbera, J.A., Arencibia, A., Morales, I., Gutierrez, C. (2005) Congenital duplication of the caudal region (monocephalus dipygus) in a kid goat. Anat Histol Embryol. 34: 61–63.
Dennis, SM. (1975) Embryonic duplications in sheep. Aust Vet J. 51: 83-87.
Doijode, SV., Thorat, N.H., Markandeya, N.M., Mamde, C.S. (1992) Monocephalus dipygus conjoined twin lamb. Indian J Anim Reprod. 13: 206.
Dominguez, R., Rott, J., Castillo, M., Pittaluga, R.R., Corriere, J.N. (1993) Caudal duplication syndrome. Am J Dis Child. 147: 1048-1052.
Hiraga, T., Dennis, S.M. (1993) Cogenital duplication. Vet Clin North Am-Food. 9: 145–161.
Kroes, HY., Takahashi, M., Zijlstra, R.J., Baert, J.A.L.L., Kooi, K.A., Hofstra, R.M.W., VanEssen, A.J. (2002) Two cases of the caudal duplication anomaly including a discordant monozygotic twin. Am J Med Genet. 112: 390–393.
Mitra, M., Basak, DN., Chakrabarti, A. (1994) Monocephalus thoracopagus tetrapus tetrabrachius monster in a Black Bengal goat. Indian Vet J. 71: 177-178.
Noden, DM., De Lahunta, A. (1985) Developmental mechanisms and malformations. In: The Embryology of Domestic Animals. Williams and Wilkins, (1st ed.) Baltimore, USA. p. 109-152.
Nottidge, H.O., Omobowale, T.O., Olopade, J.O., Oladiran, O.O., Ajala, O.O. (2007) A case of craniothoracopagus (monocephalus thoracopagus tetrabrachius) in a dog. Anat Histol Embryol. 36: 179–181.
Otiang’a-owiti, GE., Oduor-okelo, D., Kamau, G.K., Makori, N., Hendrickx, A.G. (1997) Morphology of a six-legged goat with duplication of the intestinal, lower urinary, and genital tracts. Anat Rec. 247: 432-438.
Shojaei, B., Kheirandish, R., Hasanzade, M. (2010) Monocephalus tetrapus dibrachius in a calf. Comp Clin Pathol. 19: 511–513.
Shojaei, B., Mohebbi, E., Hashemnia, Sh. (2012) Caudal duplication (monocephalus tripus dibrachius) in a kid goat. Eur J Anat. 16: 206-211.
Spencer, R. (2000) Theoretical and analytical embryology of conjoined twins: Part I, Embryogenesis. Clin Anat. 13: 36–53.
Sur, A., Kumar Sardar, S., Paria, A., (2013) Caudal duplication syndrome. J Clin Neonatol. 2: 101–102.
20. Tatsumi, N., Miki, R., Katsu, K., Yokouchi, Y. (2007) Neurturin-GFRα2 signaling controls liver bud migration along the ductus venosus in the chick embryo. Dev Biol. 307: 14–28.
Thakur, SB. (1988) Dipygus monstrosity in a calf. Indian Vet J. 65: 440.