Frajman, Božo, and Cene Fišer. “A Contribution to the Knowledge of Euphorbia Nicaeensis All. and E. Lucida W. & K. Pollinators”. Natura Sloveniae, vol. 3, no. 2, Dec. 2001, pp. 19-31, https://doi.org/10.14720/ns.3.2.19-31.