Drén, Gábor, et al. “The Effect Benefit PZ Biostimulant on the Fruit Size and Yield Production of Apricot Varieties (Prunus Armeniaca)”. Acta Agraria Debreceniensis, no. 22, May 2006, pp. 16-18, https://doi.org/10.34101/actaagrar/22/3180.