Improved formulations to the hierarchical health facility location-allocation problem. - James M. Tien; Khalaf El-Tell; Gene R. Simons (IEEE Trans. Syst. Man Cybern., 1983)

A quasihierarchical location-allocation model for primary health care planning. - James M. Tien; Khalaf El-Tell (IEEE Trans. Syst. Man Cybern., 1984)