Arenas, C., M. Hidalgo, H. Hidalgo, and C. Valenzuela. “Exploratory Study on Characteristics of Oyster Shell and Eggshell Quality in Chile”. Austral Journal of Veterinary Sciences, vol. 50, no. 3, Sept. 2018, pp. 143-7, doi:10.4067/S0719-81322018000300149.