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In this paper, we introduce a squared metric k-facility location problem (SM-k-FLP) which is a generalization of the squared metric facility location problem (SMFLP) and k-facility location problem (k-FLP). In the SM-k-FLP, we are given a client set C and a facility set F from a metric space, a facility opening cost f(i) >= 0 for each i is an element of F, and an integer k. The goal is to open a facility subset F subset of F with vertical bar F vertical bar <= k and to connect each client to the nearest open facility such that the total cost (including facility opening cost and the sum of squares of distances) is minimized. Using local search and scaling techniques, we offer a constant approximation algorithm for the SM-k-FLP.
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