GLUSHCHENKO, Alexandra; GLUSHCHENKO, Alexander; GLUSHCHENKO, Eugenia. The Generalization of the cosinus theorem and analytical calculation of multi-beam interference with an arbitrary phase distribution. European Journal of Physics Education, [S.l.], v. 11, n. 3, p. 38-46, dec. 2020. ISSN 1309-7202. Available at: <http://eu-journal.org/index.php/EJPE/article/view/277>. Date accessed: 28 jan. 2021.