Негрич, Василь Васильович, et al. “RESEARCH OF FIRMNESS OF CONVECTIV MOTION WITH PARNIM TYPE OF SPEED”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 1(21), Mar. 2019, pp. 98-111, https://pvntsh.nung.edu.ua/index.php/number/article/view/186.