PELTONEN-SAINIO, P. and JAUHIAINEN, L. 2010. Cultivar improvement and environmental variability in yield removed nitrogen of spring cereals and rapeseed in northern growing conditions according to a long-term dataset. Agricultural and Food Science. 19, 4 (Jan. 2010), 341–353. DOI:https://doi.org/10.2137/145960610794197588.