CHANGES IN 'FGN' VERSION 2.0 (2012-09-06W)
    o    citation revised
    o    new functions for HD and FD models
CHANGES IN 'FGN' VERSION 1.4 (2010-11-30)
    o    fixed NAMESPACE problem
CHANGES IN 'FGN' VERSION 1.5 (2011-02-11)
    o    citation corrected





