Jemrić, T., I. Fruk, M. Fruk, S. Radman, L. Sinkovič, and G. Fruk. “Bitter Pit in Apples: Pre- and Postharvest Factors: A Review”. Spanish Journal of Agricultural Research, Vol. 14, no. 4, Jan. 2017, p. e08R01, doi:10.5424/sjar/2016144-8491.