Sporysz, M., Szczuka, M., Tabor, S., Molenda, K., & Kuboń, M. (2019). The Use of Cluster Analysis in Assessing the Sustainability of Organic Farms. Part I. Methodical Considerations. Agricultural Engineering , 23(4), 69-76. Retrieved from http://agriceng.ptir.org/index.php/AgricEng/article/view/208