This is the paper for HCI.
The source can either be edited locally if you install all the LaTex stuff
or you can edit using a web app called ShareLatex (repo).
If using ShareLaTex, make sure you go to the menu in the upper left and "Push changes to GitHub" since it doesn't auto sync.
And feel free to not use sharelatex, I like it since I have a bad laptop and don't want to install all the stuff on it.