Jauniaux, E., Vamos, E., Libert, J., Elkhazen, N., Wilkin, P., & Hustin, J. (1987). Placental Electron-microscopy and Histochemistry in a Case of Sialic-acid Storage Disorder. Placenta, 8(4), 433-442. https://doi.org/10.1016/0143-4004(87)90071-3 (Original work published 1987)