1. Reexamination of paternal age effect in Down's syndronme;Hum Genet,1978
2. Down syndrome, paternal age, maternal age and birth order;Erickson, J.D.;Ann Hum Genet,1978
3. On data and methods in investigations on parental age effects. Comments on a paper by JD Erickson;Stene, J.; Stene, E.;Ann Hum Genet,1978
4. Bancroft's introduction to biostatistics;Ipsen, J.; Feigl, P.,1970
5. Down syndrome in livebirths by single year maternal age interval in a Swedish study: comparison with results from a New York State study;Hook, E.B.; Lindsjo, A.;Am JHum Genet,1978