Logarithmic derevative and angular density of zeros for the Blaschke product

Let z 0 = 1 be the only boundary point of zeros a n Blaschke product B ( ) , Γ m ∪ j :   < r g - θ I π 2 + ς ⋯ finite system rays, . We found asymptotics logarithmic derivative as e i φ → under condition existing angular density its related to comparison function ρ also considered inverse problem for Z whose lie on