Tetsuo AsanoNaoki KatohHisao TamakiTakeshi TokuyamaCovering Points in the Plane by k-Tours: Towards a Polynomial Time Approximation Scheme for General k.275-2831997conf/stoc/1997STOChttps://doi.org/10.1145/258533.258602db/conf/stoc/stoc1997.html#AsanoKTT97