Placental microstructure and efficiency in cloned bovines: a design-based stereological approach - Ribeiro, Antonio Augusto Coppi Maciel; Lacerda, Procássia Maria de Oliveira; Melo, Mariana Pereira de; Balieiro, Júlio Cesar de Carvalho; Souza, Romeu Rodrigues de (Cell and Tissue Research, 2008)