Pessi, Yrjö, Jorma Syvälahti, Auvo Leskelä, and Mikko Ylänen. “Fertilizing Experiments With Anhydrous Ammonia at Kotkaniemi”. Agricultural and Food Science 43, no. 4 (December 1, 1971): 213–219. Accessed July 22, 2024. https://journal.fi/afs/article/view/71800.