1. Gender determination and mating system in the autotetraploid fern Asplenium septentrionale (L.) Hoffm;Botanica Helvetica,2003
2. Comparative morphology of the gametophyte of homosporous ferns;Phytomorphology,1964
3. Gametophyte morphology and reproductive biology in Elaphoglossum;Canadian Journal of Botany,1998
4. Gametophyte ontogeny, sex expression, and genetic load as measures of population divergence in Blechnum spicant;American Journal of Botany,1979
5. The Asplenium seelosii aggr. (Aspleniaceae, Pteridophyta): morphology, cytology, ecology and taxonomy;Rivasgodaya,1993