Fasma Diele Stefania Ragni Numerical Comparison between Different Lie-Group Methods for Solving Linear Oscillatory ODEs. 476-485 2002 conf/iccS/2002-3 International Conference on Computational Science (3) http://link.springer.de/link/service/series/0558/bibs/2331/23310476.htm db/conf/iccS/iccS2002-3.html#DieleR02