Try these links. They should show what you're asking for:

http://ssfruit.cas.psu.edu/chapter4/chapter4f.htm

http://www.ext.vt.edu/pubs/treefruit...1/422-021.html

http://www.personal.psu.edu/staff/m/...e-pruning.html

I'll attach some more if I find anything better.

Dan O.