1. Barczak, B., Nowak, K., 2010. Effect of the sulphur dose and form on yielding and protein content in Komes cultivar of oat grain. Fragm. Agron. 27(1), 14-20, https://pta.up.poznan.pl/pdf/2010/FA%2027(1)%202010%20Barczak.pdf.
2. Organic carbon stock in different types of mineral soils in cropland and grassland in Latvia
3. COBORU (Centralny Ośrodek Badania Odmian Roślin Uprawnych), 2022. Preliminary yield results in post-registration experiments. Spring cereals (in Polish). COBO 104/2022 n. 350, https//www.coboru.gov.pl.
4. Increasing soil carbon storage: mechanisms, effects of agricultural practices and proxies. A review
5. Ditzler, C., Scheffe, K., Monger, H.C., (Eds.). 2017. Soil survey manual. Soil Science Division Staff. USDA Handbook 18. Government Printing Office, Washington, D.C.