http://datasheetcatalog.com/datasheets_pdf/L/M/3/1/LM311.shtml
https://www.fairchildsemi.com/datasheets/LM/LM311.pdf
http://www.ti.com/product/lm311
http://physics.gac.edu/%7Ehuber/classes/phy270/SpecSheets/LM311_National.pdf
http://www.alldatasheet.com/datasheet-pdf/pdf/53576/FAIRCHILD/LM311.html
http://www.onsemi.com/pub/Collateral/LM211-D.PDF
http://www.datasheetarchive.com/LM311-datasheet.html
http://www.alldatasheet.com/view.jsp?Searchword=LM311
http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=9&pub=5574933636&toolid=10001&campid=5336728181&customid=&icep_uq=lm311&icep_sellerId=&icep_ex_kw=&icep_sortBy=12&icep_catId=&icep_minPrice=&icep_maxPrice=&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg
https://en.wikipedia.org/wiki/Comparator
http://www.linear.com/product/LM311
http://www.hqew.net/product-data/LM311/LM311-CircuitDiagram.html
http://www.linear.com/product/LM111
http://www.mouser.com/Search/Refine.aspx?Keyword=LM311
http://www.onsemi.com/PowerSolutions/product.do?id=LM311
http://pdf.datasheetcatalog.com/datasheet/texasinstruments/lm311.pdf
http://www.bristolwatch.com/ele/vc.htm
http://www.ti.com/lit/ds/symlink/lm111-n.pdf
http://www.electroschematics.com/6229/lm-311-design-note/
http://www.digikey.com/product-detail/en/LM311N/LM311N-ND/3701387
http://www.st.com/web/en/resource/technical/document/datasheet/CD00001072.pdf
http://www.st.com/web/catalog/sense_power/FM123/SC60/SS1089/PF63703
http://www.phys.ufl.edu/courses/phy4802L/fall12/DataSheets/0djdkzrg4s3g5gt5t8w0lgcglzfy.pdf
http://www.datasheetcatalog.com/datasheets_pdf/L/M/3/1/LM311N.shtml
https://octopart.com/lm311n-stmicroelectronics-55413588
http://www.physics.unlv.edu/~bill/PHYS483/comparators.pdf
http://www.mouser.com/ProductDetail/STMicroelectronics/LM311N/?qs=swDD%252bF%252bps7cgd2U1sCMsJw%3d%3d
http://www.eleccircuit.com/best-12v-battery-charger-circuit-using-lm311/
http://pdf1.alldatasheet.com/datasheet-pdf/view/8611/NSC/LM311.html
http://www.futurlec.com/Linear/LM311N.shtml