@misc{miscd00127a4,
title   = {Use of ultrasound in the differential diagnosis of the benign and malignant forms of gestational trophoblastic disease},
author = {Machado, José Cassiano and Berezowski, Aderson Tadeu and Freitas, Maurício Mesquita Sabino de and Andrade, Jurandyr Moreira de and Carrara, Helio Humberto Angotti and Bighetti, Sérgio and Gomes, Uilho Antônio},
year = {1997},
booktitle   = {Congress of World Federation for Ultrasound in Medicine and Biology}
}