2 citations to https://www.mathnet.ru/rus/smj831

1. Cerejeiras P., Gurlebeck K., Kahler U., Malonek H., “A quaternionic Beltrami–type equation and the existence of local homeomorphic solutions”, Zeitschrift fur Analysis und Ihre Anwendungen, 20:1 (2001), 17–34        
2. Malonek H.R., “Beltrami systems in the context of Clifford analysis”, Proceedings of the Second ISAAC Congress, International Society for Analysis, Applications and Computation, 7, 2000, 1481–1495