Płaza, A., B. Gąsiorowska, E. Rzążewska, A. Cybulska, and R. Górski. “The Effect of Manuring With Undersown Catch Crop, and Production System on the Potato Tuber Content of Microelements”. Italian Journal of Agronomy, Vol. 14, no. 3, Sept. 2019, pp. 176-82, doi:10.4081/ija.2019.1343.