HentoshО. Y., PritulaN. N., & PrykarpatskyY. A. (2018). Differential-geometric structure and the Lax – Sato integrability of a class of dispersionless heavenly type equations. Ukrains’kyi Matematychnyi Zhurnal, 70(2), 293-297. Retrieved from http://umj.imath.kiev.ua/index.php/umj/article/view/1557