  We consider the electron-positron pair production by a photon in Coulomb
field near threshold. We obtain the analytical results for the particle energy
spectrum and angular distribution exactly in the parameter $Ze^2/\hbar v$. We
show that Furry-Sommerfeld-Maue approximation for the wave functions used by
Nishina, Tomonaga and Sakata is not sufficient and leads to wrong results.
