Found a link but not the one I was looking for..
http://www.abcbodybuilding.com/magazine/power partials.htm
For instance, take a man who can parallel squat 250 pounds for 6-10 repetitions. If he becomes strong enough to lift 300 for 10 repetitions, he will without a doubt have larger legs. Its that simple. A quicker way to adapt to these greater poundage's is to actually lift with them. Unfortunately, it is obvious that this man could probably only lift 300 for perhaps 1-2 reps before hitting failure. However if he uses the partial repetition principle and performs a 45 degree squat rather than a parallel one, he can easily handle this kind of weight for 10-12 repetitions. This will train his neural system to be more efficient at lifting heavier poundage's and it will also stimulate a tremendous amount of fast twitch muscle fiber growth! In short, by doing this, his body will be able to handle this weight at a parallel range, at an extremely faster rate!