References
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- Bassett , E.G. and Phillips , D.S.M. 1955a . Changes in the pelvic region of the ewe during pregnancy and parturition . N.Z.vet.J. , 3 : 20 – 25 .
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- Colcher , A.E. and Sussman , W. 1944 . A practical technique for roentgen pelvimetry with a new positioning . Am. J. Roentg. , 51 : 207 – 214 .