Template:Bennert et al., 1989
- Bennert, W.H., Pichi-Sermolli, R.E.G., Rasbach, H., Rasbach, K. & Reichstein, T. 1989. Asplenium x helii Lusina the valid name for the hybrids between A. petrarchae (Guérin) DC. and A. trichomanes L. (Aspleniaceae, Pteridophyta). II. Detailed description and illustrations. Webbia 43(2): 311–337. DOI: 10.1080/00837792.1989.10670458
