M.  Kaufmann and Wink, M., ?Molecular systematics of the Nepetoideae (family Labiatae): phylogenetic implications from rbcL gene sequences?, Zeitschrift fur Naturforschung C-Journal of Biosciences, vol. 49, pp. 635?645, 1994.

N.  Wink and Kaufmann, M., ?Phylogenetic relationships between some members of the subfamily Lamioideae (family Labiatae) inferred from nucleotide sequences of the rbcL gene?, Bot Acta, vol. 109, pp. 139?148, 1996.