STEFANOU, S., and Z. PAPAZAFEIRIOU. “THE EFFECT OF SOIL PHYSICAL PROPERTIES OF AN ENTISOL ON THE GROWTH OF YOUNG POPLAR TREES (POPULUS SP.)”. Bulgarian Journal of Agricultural Science, vol. 21, no. 4, Aug. 2015, pp. 807-12, https://agriacad.eu/ojs/index.php/bjas/article/view/6299.