Freitas, E. R., Sakomura, N. K., Gonzalez, M. M., & Barbosa, N. A. A. (2004). Comparison of methods to measure the specific gravity of laying hen eggs. Pesquisa Agropecuaria Brasileira, 39(5), 509–512. https://doi.org/10.1590/S1678-3921.pab2004.v39.6800