Is this recurrence relation right? found it on some notes but i cant seem to prove or find something similar. btw [math]P_{l}^{m}[\math] is the associated Legendre function of degree l and order m.
[math]P_{l}^{m}[/math]*
http://people.math.sfu.ca/~cbm/aands/page_338.htm
Probably follows easily from 8.14.13 if at all.