1. Carlini, Francesco;Biographical Encyclopedia of Astronomers;2014
2. References;Physical Problems Solved by the Phase-Integral Method;2002-06-13
3. Problems with solutions;Physical Problems Solved by the Phase-Integral Method;2002-06-13
4. Description of the phase-integral method;Physical Problems Solved by the Phase-Integral Method;2002-06-13
5. Historical survey;Physical Problems Solved by the Phase-Integral Method;2002-06-13