BÓNA, K.; LÉNÁRT, B. Supporting Demand Planning Process with Walsh-Fourier Based Techniques. Periodica Polytechnica Transportation Engineering, [S. l.], v. 42, n. 2, p. 97–102, 2014. 10.3311/PPtr.7225. Disponível em: https://pp.bme.hu/tr/article/view/7225. Acesso em: 4 dec. 2022.