Sperling, K., Pelz, J., Wegner, R. D., Dörries, A., Grüters, A., & Mikkelsen, M. (1994). Fallout from Chernobyl. Authors stand by study that Chernobyl increased trisomy 21 in Berlin. BMJ Group.

Sperling, K., J. Pelz, R. D. Wegner, A. Dörries, A. Grüters, και M. Mikkelsen. Fallout From Chernobyl. Authors Stand By Study That Chernobyl Increased Trisomy 21 in Berlin. BMJ Group, 1994.

Sperling, K., et al. Fallout From Chernobyl. Authors Stand By Study That Chernobyl Increased Trisomy 21 in Berlin. BMJ Group, 1994.