Masri, H. 2014. Quantitative economics as a scientific approach to the solution of problems of a complex nature – in honor of Professor Willem Karel M. Brauers on the occasion of his 90th birthday. Technological and Economic Development of Economy. 20, 3 (Oct. 2014), 590-600. DOI:https://doi.org/10.3846/20294913.2014.966350.