http://spinroot.com/spin/Man/ltl.html
http://en.wikipedia.org/wiki/Linear_temporal_logic
http://www.dcs.gla.ac.uk/~muffy/MRS4-2002/lect11.ppt

http://www.lsv.ens-cachan.fr/~gastin/ltl2ba/index.php
http://spinroot.com/spin/Man/index.html
http://spinroot.com/spin/Man/promela.html

LTL vs CTL :

http://spinroot.com/spin/Doc/course/lecture12.pdf p. 9, p. 15, p. 18
http://www-i2.informatik.rwth-aachen.de/i2/fileadmin/user_upload/documents/Introduction_to_Model_Checking/mc_lec18.pdf
  (downloaded)