Template:Bennert et al., 1988
- Bennert, W.H., Pichi-Sermolli, R.E.G., Rasbach, H., Rasbach, K. & Reichstein, T. 1988. Asplenium x helii Lusina the valid name for the hybrids between A. petrarchae (Guérin) DC. and A. trichomanes L. (Aspleniaceae, Pteridophyta). I. Nomenclatural notes. Bauhinia 9(1): 103–106. PDF