S. Mahmood

Synthesis and X-ray crystal structures of Schiff bases prepared from salicylaldehyde and the diamino acids L-2-amino-3-methylaminopropanoic acid, DL-2,4-diamino-butanoic acid and DL-2,3-diaminopropanoic acid

M. A. Malik, P. Nunn, P. O’Brien, 1998 .

Short communication: trophoblast proliferation is increased in chorionic villi from pregnancies with fetal trisomy 18.

K. Nicolaides, N. Sebire, D. Fowler, 2000, Placenta.