Required citations
******************

When you publish results in the scientific literature that were
obtained with programs of the AMS package, you are required to include
references to the program package with the appropriate release number,
and a few key publications.

For calculations using GFN-FF:
   S. Spicher, S. Grimme.   *Robust Atomistic Modeling of Materials,
   Organometallic, and Biochemical Systems*,  Angew. Chemie Int. Edit.
   59, 15665-15673 (2020)
