http://www.microscopyu.com/galleries/confocal/nostoc.html
http://www.yourdictionary.com/ahd/n/n0171000.html
http://www.glerl.noaa.gov/seagrant/glwl/algae/cyanophyta/cyanophyta.html
http://machaut.uchicago.edu/cgi-bin/webster.sh?word=nostoc 1913 webster s dictionary
davidson, alan. oxford companion food (1999), nostoc . isbn 0-19-211579-0
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