National planning of commodity import operations : the case of Portugal's feed grain imports

• Author(s): Guimarães, Rui Manuel Campos
• Date: 1981
• Persistent ID: http://hdl.handle.net/10216/11545
• Origin: Repositório Aberto da Universidade do Porto
• Subject(s): Mecânica
• Document Type: Doctoral thesis
• Language: English