Hua Loo Keng's Problem Involving Primes of a Special Type
  Let $\eta$ be a quadratic irrationality. The variant of Hua Loo Keng's problem involving primes such that $a<\{\eta p^2\}<b$, where $a$ and $b$ are arbitrary real numbers of the interval $(0,1)$, solved in this paper. 
Sergey A. Gritsenko and Natalya N. Motkina