On Boundedness of the Admissible Time Slowing Down by the Gravitational   Field
  It is shown that there exists, in the field theory of gravitation, contrary to the General Theory of Relativity (GTR), a bound for admissible time slowing down by the gravitational field which excludes a possibility of unbounded compression of matter by the gravity forces. 
S.S. Gershtein, A.A. Logunov, M.A. Mestvirishvili