Венгеров, Игорь Романович, and Анатолий Павлович Слесаренко. “Approximate Solutions for Nonlinear Boundary Value Problems of Desorbed Methane Filtering in Heterogeneous Coal Beds”. Eastern-European Journal of Enterprise Technologies 1, no. 4(67) (February 12, 2014): 4–9. Accessed July 17, 2024. https://journals.uran.ua/eejet/article/view/21052.