Contemporary Mathematics. Fundamental DirectionsContemporary Mathematics. Fundamental DirectionsСовременная математика. Фундаментальные направления2413-36392949-0618Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)2226410.22363/2413-3639-2018-64-1-98-130New ResultsНовые результатыResearch ArticleSome Free Boundary Problems Arising in Rock MechanicsНесколько задач со свободной границей, возникающих в механике горных породMeirmanovA MМейрмановА Мanvarbek@list.ruGaltsevO VГальцевО Вgaltsev_o@bsu.edu.ruGaltsevaO AГальцеваО Аgaltseva@bsu.edu.ruYachay Tech UniversityBelgorod State UniversityБелгородский государственный университет15122018641Differential and Functional Differential EquationsДифференциальные и функционально-дифференциальные уравнения9813029112019Copyright ©; 2019, Contemporary Mathematics. Fundamental DirectionsCopyright ©; 2019, Современная математика. Фундаментальные направления2019Contemporary Mathematics. 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