Manayay Sánchez, Damián, et al. “Evaluation of Shape, Roundness, Sphericity and Equality in Commercial Yellow Hard Corn (Zea Mays L.) and Pea (Pisum Sativum) Grains”. Revista De Investigaciones De La Universidad Le Cordon Bleu, vol. 3, no. 1, July 2016, pp. 5-17, doi:10.36955/RIULCB.2016v3n1.001.