KurdachenkoL. A., PypkaO. O., and SubbotinI. Y. “On Leibniz Algebras Whose Subalgebras Are Either Ideals or Self-Idealizing”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 73, no. 6, June 2021, pp. 811 -26, doi:10.37863/umzh.v73i6.6688.