MARZEC, Jerzy; PISULEWSKI, Andrzej. The Measurement of Time-Varying Technical Efficiency and Productivity Change in Polish Crop Farms. German Journal of Agricultural Economics, [S. l.], v. 68, n. 1, 2019. DOI: 10.52825/gjae.v68i1.2122. Disponível em: https://www.tib-op.org/ojs/index.php/gjae/article/view/2122. Acesso em: 25 nov. 2024.