Before revision: Yu. Levin 65 and Yamnitsky , Levin 82 , has little sensitivity to numerical errors and to the number of inequalities.
After revision: Yu. Levin 65 and Yamnitsky , Levin 82 considered by A.Y. Levin in 1965 and by Yamnitsky and myself in 1982. It has little sensitivity to numerical errors and to the number of inequalities.