Higher Order, Polar and Sz.-Nagy's Generalized Derivatives of Random   Polynomials with Independent and Identically Distributed Zeros on the Unit   Circle
  For random polynomials with i.i.d. (independent and identically distribu-ted) zeros following any common probability distribution $\mu$ with support contained in the unit circle, the empirical measures of the zeros of their first and higher order derivatives will be proved to converge weakly to $\mu$ a.s. (almost sure(ly)). This, in particular, completes a recent work of Subramanian on the first order derivative case where $\mu$ was assumed to be non-uniform. The same a.s. weak convergence will also be shown for polar and Sz.-Nagy's generalized derivatives, on some mild conditions. 
Pak-Leong Cheung, Tuen Wai Ng, Jonathan Tsai and S.C.P. Yam
math.CV