Chester, Clive R.; Friedman, Bernard; Ursell, Fritz (1957). "An extension of the method of steepest descents". Mathematical Proceedings of the Cambridge Philosophical Society. 53 (3). Cambridge University Press: 599–611. Bibcode:1957PCPS...53..599C. doi:10.1017/S0305004100032655. S2CID122589439.
Chester, Clive R.; Friedman, Bernard; Ursell, Fritz (1957). "An extension of the method of steepest descents". Mathematical Proceedings of the Cambridge Philosophical Society. 53 (3). Cambridge University Press: 599–611. Bibcode:1957PCPS...53..599C. doi:10.1017/S0305004100032655. S2CID122589439.
ima.org.uk
"IMA Gold Medal". Retrieved 16 May 2018. Institute of Mathematics and its Applications
Chester, Clive R.; Friedman, Bernard; Ursell, Fritz (1957). "An extension of the method of steepest descents". Mathematical Proceedings of the Cambridge Philosophical Society. 53 (3). Cambridge University Press: 599–611. Bibcode:1957PCPS...53..599C. doi:10.1017/S0305004100032655. S2CID122589439.