Franca-Martins, A M, Z Graubard, G A Holloway, e F J Van der Merwe. 1990. «Placental Haemangioma Associated With Acute Fetal Anemia in Labour». Acta Médica Portuguesa 3 (3). Lisbon, Portugal:187-9. https://doi.org/10.20344/amp.4554.