Ahlheim M, Frör O. Valuing the non-market production of agriculture - Bewertung nicht-marktlicher Agrarproduktion. GER J AGR ECON [Internet]. 2003 Dec. 4 [cited 2025 Jul. 17];52(8). Available from: https://www.tib-op.org/ojs/index.php/gjae/article/view/1569