ПРИСТАВКА, П. Not updating binary sequence of periods of smooth functions of two variables by linear operators. Proceedings of National Aviation University, [S. l.], v. 39, n. 2, p. 173–177, 2009. DOI: 10.18372/2306-1472.39.1735. Disponível em: https://jrnl.nau.edu.ua/index.php/visnik/article/view/1735. Acesso em: 19 may. 2024.