IVCHENKO, Vladimir V.. Analysis of a thin optical lens model. European Journal of Physics Education, [S.l.], v. 2, n. 3, p. 33-37, sep. 2011. ISSN 1309-7202. Available at: <http://eu-journal.org/index.php/EJPE/article/view/143>. Date accessed: 20 apr. 2021.