Winter, K., Becker, A., Münster, T., Kim, J. T., Saedler, H., & Theissen, G. (1999). MADS-box genes reveal that gnetophytes are more closely related to conifers than to flowering plants. The National Academy of Sciences.

Winter, Kai-Uwe, Annette Becker, Thomas Münster, Jan T. Kim, Heinz Saedler, và Günter Theissen. MADS-box Genes Reveal That Gnetophytes Are More Closely Related to Conifers Than to Flowering Plants. The National Academy of Sciences, 1999.

Winter, Kai-Uwe, et al. MADS-box Genes Reveal That Gnetophytes Are More Closely Related to Conifers Than to Flowering Plants. The National Academy of Sciences, 1999.