https://www.smashingmagazine.com/2010/12/using-the-less-css-preprocessor-for-smarter-style-sheets/
https://webdesign.tutsplus.com/articles/get-into-less-the-programmable-stylesheet-language--webdesign-5216
https://css-tricks.com/sass-vs-less/
http://www.hongkiat.com/blog/less-basic/
http://lesscss.org/
http://www.sitepoint.com/understanding-less-guards-loops
http://www.sitepoint.com/less-beyond-basics-bootstrap-mixins-library
http://www.hongkiat.com/blog/less-basic/
http://lesscss.org/
http://lessframework.com/
http://www.sitepoint.com/more-colors-less/
http://www.youtube.com/watch?v=1l3JgDGl_Z8
http://www.sitepoint.com/a-comprehensive-introduction-to-less/
http://www.sitepoint.com/a-comprehensive-introduction-to-less-mixins
http://coryschires.com/dynamic-css3-buttons-with-less/
http://www.sitepoint.com/blogs/2010/08/17/css-a-little-more-on-less/
http://net.tutsplus.com/tutorials/php/how-to-squeeze-the-most-out-of-less/
http://www.sitepoint.com/custom-uikit-theme-with-gulp-less
http://www.sitepoint.com/color-alchemy-with-less-creating-color-schemes-and-palettes/
http://blog.bitovi.com/mobile-first-modules/