Advances Mathematical Methods for Scientists and Engineers, 1978. ,
Finding gaps in a spectrum, Journal of Physics A: Mathematical and Theoretical, vol.40, issue.39, pp.921-928, 2007. ,
DOI : 10.1088/1751-8113/40/39/F02
URL : https://hal.archives-ouvertes.fr/hal-00157479
Quantum Signatures of Chaos, 2001. ,