Sherwood, P., de Vries, A. H., Guest, M. F., Schreckenbach, G., Catlow, C. R. A., French, S. A., Sokol, A. A., Bromley, S.
T., Thiel, W., Turner, A. J., Billeter, S., Terstegen, F., Thiel, S., Kendrick, J., Rogers, S. C., Casci, J., Watson, M.,
King, F., Karlsen, E., Sjøvoll, M., Fahmi, A., Schäfer, A., & Lennartz, C. (2003).
QUASI: A general purpose implementation of the QM/MM approach and its application to problems in catalysis.
Journal of Molecular Structure-Theochem, 632(Sp. Iss. Sp. Iss. SI), 1-28. doi:10.1016/S0166-1280(03)00285-9.