ФЕДАК, Іван Васильович. SOME SUBSTANDARD METHODS OF THE SOLUTION OF EQUATIONS AND PROOF OF INEQUALITIES. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, [S. l.], n. 1(5), p. 46–52, 2019. Disponível em: https://pvntsh.nung.edu.ua/index.php/number/article/view/311. Acesso em: 13 mar. 2025.