中国科学院数学与系统科学研究院期刊网
AN ASYMPTOTIC INVESTIGATION OF A TYPE OF EXPONENTIAL INTEGRALS
L.C.HSU(1),J.R.RAVETZ(2)
Acta Mathematica Sinica, Chinese Series . 1952, (1): 45 -49 .  DOI: 10.12386/A1952sxxb0004