1. Beitrage zur physiologie und pathologie der mehrlingsgeburten beim menschen;Weinberg, W.;Pfluegers Arch
2. A discussion of Weinberg's rule on the zygosity of twins;Cannings, C.;Ann Hum Genet
3. A note on mongolism in twins;Smith, A.;Br J Prev Soc Med,1955
4. A further note on mongolism in twins;Smith, A.;Br J Prev Soc Med
5. Measures of twin concordance;Allen, G.; Harvald, B.; Shields, J.;Acta Genet (Basel),1967