Template:Rasbach et al., 1990a
- Rasbach, H., Rasbach, K., Reichstein, T., Viane, R.L.L. & Bennert, H.W. 1990. Asplenium obovatum subsp. obovatum var. protobillotii and its hybrid with Asplenium obovatum subsp. lanceolatum in Spain (Aspleniaceae, Pteridophyta). Botanica Helvetica 100(1): 3–16. DOI: 10.5169/seals-69707
