1. Bojan Nikolic . We have modified the implementations of Khachiyan's Algorithm by B. Nikolic from bnmin1-1.11 package for the Computation of Minimum Volume Enclosing Ellipsoids in /src/external/minimum_ellipsoid. 2. Kjell Konis , Stefan I. Larimore and Timothy A. Davis , Kjell Eikland, Michel Berkelaar, Richard Stallman, Authors of lpsolve package , in /src/external/lpsolve.