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References

  • McArthur, Norma (1953). The frequency of monovular and binovular twin-births in Italy, 1949–1950 Acta genet. med. Gemell. 2, 11.
  • McArthur, Norma (1953). Changes in twin frequencies. Acta genet. med. Gemell. (in the Press).
  • Penrose, L. S. (1934). A method of separating the relative aetiological effects of birth order and maternal age, with special reference to mongolian imbecility. Ann. Eugen., Lond., 6, 108.
  • Waterhouse, J. A. H. (1950). Twinning in twin pedigrees. Brit. J. Soc. Med. 4, 197.