@article {29, title = {Hanskerpia gen. nov. and phylogenetic relationships among the most ancient conifers (Voltziales)}, journal = {Taxon}, volume = {54}, year = {2005}, month = {08/2005}, pages = {733-750}, chapter = {733}, url = {http://www.geologia.unam.mx/igl/deptos/paleo/hernandezcg/pdf/pdf9.pdf}, author = {Rothwell, Gar W. and Mapes, Gene and Hernandez-Castillo, Genaro R.} }