Operations research in postal services - a survey. - Jatinder N. D. Gupta; LeRoy J. Krajewski (Comput. Oper. Res., 1977)

Manpower allocation in U.S. postal facilities: A heuristic approach. - Michael J. Showalter; LeRoy J. Krajewski; Larry P. Ritzman (Comput. Oper. Res., 1977)