In C/C++, several "quoted" strings are just concatenated. Thus, you will need a space at the end of each line here to make sure words don't just run into each other.  (Also, enclose the URL above in \\url{...} and add a period behind it.)

I see that the comment here addresses my question from above about what the two parameters mean (namely, that they are xi and alpha). It is ok if above you simply refer to the "general description of this model".