1. Changing demography of trisomy 18;Young 1, Cook J, Mehta L;Arch Dis Child,1986
2. Survival of trisomy 18;Carter, P.; Pearn, J.; Bell, J.; Martin, N.; G, Anderson N.;Clin Genet,1985
3. Survival in trisomy 18;Root, S.; Carey, J.C.;Am Med Genet,1994
4. Trisomy 18 syndrome;KLSmith's, Jones
5. Clinical experience with trisomies 18 and 13;Hodes, M.E.; Cole, J.; Palmer, C.G.; Reed, T.;Med Genet,1978