Barbosa, R. T., Esper, C. R., & de Freitas, A. R. (1998). Midpiece length of bovine spermatozoa and its relationships to semen traits and fertility. Pesquisa Agropecuaria Brasileira, 33(10), 1661–1665. https://doi.org/10.1590/S1678-3921.pab1998.v33.4991