Row-Column Aggregation for Rectilinear Distance p-Median Problems. - Richard L. Francis; Timothy J. Lowe; M. Brenda Rayco (Transp. Sci., 1996)

A p-center grid-positioning aggregation procedure. - M. Brenda Rayco; Richard L. Francis; Arie Tamir (Comput. Oper. Res., 1999)

Aggregation error for location models: survey and analysis. - Richard L. Francis; Timothy J. Lowe; M. Brenda Rayco; Arie Tamir (Ann. Oper. Res., 2009)