Version 1.2: 17.11.2002; placed under GPL; exit code with no parameter given is 1;
Version 1.1: 11.05.2002; bibtex keys are suggested; if no parameters are given, program exits gracefully, exit (0); file format of input is checked for ISI; includes README file; includes man page; includes documentation;
Version 1.0: before May 2002; basic code