References
**********

The MOPAC engine in the 2026.1 of the Amsterdam Modeling Suite is a
modified version of the standalone MOPAC2016 program developed by Dr.
Jimmy Stewart.

1. AMS 2026.1 MOPAC: MOPAC Engine based on the MOPAC2016 source code
   (James J.P. http://openmopac.net)

2. James J.P. Stewart, *Optimization of parameters for semiempirical
   methods VI: more modifications to the NDDO approximations and re-
   optimization of parameters*, J. Mol. Modeling 19, 1-32 (2013)

A full list of references for the MOPAC package can be found on the
official MOPAC references page.
