KUFEL-GAJDA, Justyna; GAJDA, Janusz. Patent activity in the Polish food system and the business cycle. Conclusions from spectral analysis. Technological and Economic Development of Economy, [S. l.], v. 32, n. 2, p. 571–596, 2026. DOI: 10.3846/tede.2026.25504. Disponível em: https://journals.vilniustech.lt/index.php/TEDE/article/view/25504. Acesso em: 21 mar. 2026.