NIKOLAEVA, Nadezhda N..
 Morphological forms of Karelian birch.
<strong>Modern Phytomorphology</strong>, [S.l.], v. 6, p. 161-166, apr. 2014.
ISSN 2227-9555.
Available at: &lt;<a href="http://ojs.phytomorphology.org/index.php/MP/article/view/146" target="_new">http://ojs.phytomorphology.org/index.php/MP/article/view/146</a>&gt;. Date accessed: 12 apr. 2018.
doi: <a href="https://doi.org/10.5281/zenodo.160621">https://doi.org/10.5281/zenodo.160621</a>.