@Article{ CHARMM1983,
   title = "CHARMM: A Program for Macromolecular Energy, Minimization, and Dynamics Calculations",
   author = "Brooks, B.R. and Bruccoleri, R.E. and Olafson, D.J. and States, D.J. and Swaminathan, S. and Karplus, M.",
   journal = "Journal of Computational Chemistry",
   pages = "187-217",
   volume = "4",
   year = "1983"
}

@InBook{ CHARMMFF,
   title = "CHARMM: The Energy Function and Its Parameterization with an Overview of the Program",
   series = "The Encyclopedia of Computational Chemistry",
   author = "MacKerel Jr., A.D. and Brooks III, C.L. and Nilsson, L. and Roux, B. and Won, Y. and Karplus, M.",
   editor = "P. v. R. Schleyer et al.",
   publisher = "John Wiley \& Sons: Chichester",
   pages = "271-277",
   volume = "1",
   year = "1998"
}