Ferreira, C. C., and S. O. Souza. “LevRad Software As a Tool to Learn How to Proceed With an Evaluation of Barriers”. Cellular and Molecular Biology 57, no. 2 (May 30, 2011): 1500–04. Accessed May 4, 2024. https://cellmolbiol.org/index.php/CMB/article/view/933.