  We study scaling properties of self avoiding polymer stars and networks of
arbitrary given but fixed topology. We use massive field theoretical
renormalization group framework to calculate critical exponents governing their
universal properties (star exponents). Calculations are performed directly in
three dimensions, renormalization group functions are obtained in three loop
approximation. Resulting asymptotic series for star exponents are resummed with
the help of Pade-Borel and conformal mapping transformation.
