Hamann, F. A. ., A. . Fiebig, and G. . Noga. “Impact of Nitrogen Fertilization on Chlorophyll Content and Yield of Barley Cultivars Assessed by Fluorescence-Based Approaches”. Canadian Journal of Agriculture and Crops, vol. 5, no. 2, July 2020, pp. 138-52, doi:10.20448/803.5.2.138.152.