==References==
{{reflist|refs=<references><ref name="asl">DITMARSCH, H. van. Logic courseware. 2010. '''A Comprehensive list of Tools for doing Logic'''. Association for Symbolic Logic. Disponível em: [http://www.ucalgary.ca-/aslcle/logic-courseware/].</ref><ref name="wiedijk">WIEDIJK, F. '''Digital Math by Categories with Samples'''. 2007. A compiled list of 300 Tools sorted by implementation, interaction, supported logic and size effort. Disponível em: [http://www.cs.ru.nl/ ̃freek/digimath/bycategorydigimathbycategory.html].</ref>}}</references>