ČREPINŠEK, Zalika, and Lučka KAJFEŽ-BOGATAJ. “The Determination and Significance of the Base Temperature for Calculating Growing Degree Days”. Acta Agriculturae Slovenica, vol. 77, no. 2, Dec. 2001, pp. 319–327, https://doi.org/10.14720/aas.2001.77.2.15728.