Faramroze G. Engineer George L. Nemhauser Martin W. P. Savelsbergh Jin-Hwa Song The Fixed-Charge Shortest-Path Problem. 578-596 2012 24 INFORMS J. Comput. 4 https://doi.org/10.1287/ijoc.1110.0469 db/journals/informs/informs24.html#EngineerNSS12