Zinchenko, T.N. and Murach, A.A. (2012) “Douglis-Nirenberg elliptic systems in Hörmander spaces”, Ukrains’kyi Matematychnyi Zhurnal, 64(11), pp. 1477–1476. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2674 (Accessed: 5 December 2025).