ROTTENSTEINER, Walter K..
 Attempt of a morphological differentiation of Helleborus species in the Northwestern Balkans.
<strong>Modern Phytomorphology</strong>, [S.l.], v. 9, n. Suppl., p. 17-33, apr. 2016.
ISSN 2227-9555.
Available at: &lt;<a href="http://ojs.phytomorphology.org/index.php/MP/article/view/35" target="_new">http://ojs.phytomorphology.org/index.php/MP/article/view/35</a>&gt;. Date accessed: 11 apr. 2018.
doi: <a href="https://doi.org/10.5281/zenodo.159701">https://doi.org/10.5281/zenodo.159701</a>.