Laudański, Zbigniew, Dariusz Mańkowski, Leszek Sieczko, and Monika Janaszek-Mańkowska. 2021. “The Application of Orthogonal Contrasts to Determine Homogeneous Groups”. Plant Breeding and Seed Science 82 (December):31-44. https://doi.org/10.37317/pbss-2021-0003.