FANDEL, Peter - BARTOVÁ, Ľubica. The effect of Slovak farms membership in the producers organisations. A metafrontier approach. In 10th International conference on applied economics. 1 st ed. 293 s. ISBN 978-83-65605-10-8. International conference on applied economics. Olsztyn : Institute of Economic Research, 2019, s. 82-83. Available on Internet:<http://economic-research.pl/Books/index.php/eep/catalog/view/39/42/63-1>