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I'm not sure that you will find an article that precisely defines shape vs. purpose. A lot of that varies by user. For instance, some folks want a skinning knife to have a big belly to it. Others don't. I've read of some folks who use their tantos for everything. Others only consider it a stabbing weapon. Recurves are usually meant for slicing, but lots of folks use them as their EDC. The generalities offered by 357Wheelgunner may be as good as you are going to get.
Persoanally, I have a fondness for drop points because I haven't found much that I cannot do with them.