Reference:
 - Author: Emsley, P. and Lohkamp, B. and Scott, W. G. and Cowtan, K.
   Title: Features and development of Coot
   Journal: Acta Crystallographica Section D
   Year: 2010
   Volume: 66
   Number: 4
   Pages: 486--501
   DOI: 10.1107/S0907444910007493
   URL: http://scripts.iucr.org/cgi-bin/paper?S0907444910007493
   eprint: http://journals.iucr.org/d/issues/2010/04/00/ba5144/ba5144.pdf
 - Author: Emsley, Paul and Cowtan, Kevin
   Title: "Coot: model-building tools for molecular graphics"
   Journal: Acta Crystallographica Section D
   Year: 2004
   Volume: 60
   Number: 12 Part 1
   Pages: 2126--2132
   DOI: 10.1107/S0907444904019158
   URL: http://scripts.iucr.org/cgi-bin/paper?S0907444904019158
   eprint: http://journals.iucr.org/d/issues/2004/12/01/ba5070/ba5070.pdf

