Authors: Layde Peter M. Erickson David J. Falek Arthur McCarthy Brian J.

Citation: M. Layde Peter et al., Congenital Malformation in Twins, American journal of human genetics , 32(1), 1980, pp. 69-78

Authors: Erickson David J.

Citation: J. Erickson David, Paternal Age and Down Syndrome, American journal of human genetics , 31(4), 1979, pp. 489-497