Unity Melee System

http://answers.unity3d.com/questions/249579/melee-attacking-multiple-enemies.html

http://gamedev.stackexchange.com/questions/69344/how-can-i-implement-a-directional-melee-attack

http://answers.unity3d.com/questions/182449/enemies-in-my-range.html

http://answers.unity3d.com/questions/14207/how-to-apply-explosionmagicgrenade-damage-to-detec.html

Useful Unity Tips

http://devmag.org.za/2012/07/12/50-tips-for-working-with-unity-best-practices/