1. The Chemical Constituents of Haematomma Ventosum (L.) Massal in the British isles
2. Rambaut A. (2012) FigTree, v. 1.4.0. Institute of Evolutionary Biology, University of Edinburgh. Available at: http://tree.bio.ed.ac.uk/software/ figtree/.
3. Rindenbewohnende Arten der Flechtengattung Ophioparma in Amerika;Kalb;Bibliotheca Lichenologica,1995
4. Notes on the chemical and morphological variation of the lichen Ophioparma ventosa in East Fennoscandia;Skult;Annales Botanici Fennici,1997
5. Some noteworthy additions to the lichen flora of India and Nepal;Awasthi;University of Colorado Studies, Series in Biology,1963