Tur\'an Inequalities for Three Term Recurrences with Monotonic   Coefficients
  We establish some new Tur\'an's type inequalities for orthogonal polynomials defined by a three-term recurrence with monotonic coefficients. As a corollary we deduce asymptotic bounds on the extreme zeros of orthogonal polynomials with polynomially growing coefficients of the three-term recurrence. 
Ilia Krasikov
math.CA