Заторський, Роман Андрійович. “Scalar Product of a Vector on a Paradeterminant of a Triangular Matrix and Its Application”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 1(1), Mar. 2019, pp. 22-30, https://pvntsh.nung.edu.ua/index.php/number/article/view/338.