Kurdachenko, L. A., et al. “On Leibniz Algebras Whose Subalgebras Are Either Ideals or Self-Idealizing”. Ukrains’kyi Matematychnyi Zhurnal, vol. 73, no. 6, June 2021, pp. 811-26, https://doi.org/10.37863/umzh.v73i6.6688.