Thackeray, J.F. 2019. Alpha and sigma taxonomy of Lystrosaurus murrayi and L. declivis, Triassic dicynodonts (Therapsida) from the Karoo Basin, South Africa. South African Journal of Science. 115, 3/4 (Mar. 2019). DOI:https://doi.org/10.17159/sajs.2019/a0296.