JOHNSEN, E. Max Davies and Michel Verhulst, ed.: Operational Research in Practice, 1958, 201 p., Pergamon Press, 84 sh. Ledelse og Erhvervsøkonomi, [S. l.], v. 23, 1959. Disponível em: https://tidsskrift.dk/ledelseogerhvervsoekonomi/article/view/33768. Acesso em: 27 sep. 2024.