H. R. Klein

[Phase coordination between maternal and fetal heart rhythm during pregnancy (author's transl)].

G. Hildebrandt, H. R. Klein, 1979, Klinische Wochenschrift.

Maternal Choline Supplementation Modulates Placental Nutrient Transport and Metabolism in Late Gestation of Mouse Pregnancy.

M. Roberson, M. Caudill, J. Brenna, 2017, The Journal of nutrition.