SRFLP instances with number of facilities in {15, 17, 18}

The SRFLP instance with 15 facilities was introduced in: Amaral, A. R. S. (2006) On the exact solution of a facility layout problem. European Journal of Operational Research, 173: 508-518. http://dx.doi.org/10.1016/j.ejor.2004.12.021 The SRFLP instances with 17 and 18 facilities were introduced in: Amaral, A. R. S. (2008) An Exact Approach to the One-Dimensional Facility Layout Problem. Operations Research, 56 (4): 1026-1033. https://doi.org/10.1287/opre.1080.0548