中国科学院数学与系统科学研究院期刊网
PROPERTIES OF THE SOLUTIONS OF LINEAR PARTIAL DIFFERENTIAL EQUATIONS WITH SINGULAR COEFFICIENTS IN THE NEIGHBORHOOD OF SINGULAR LINE(SINGULAR SURFACE)
王光寅
Acta Mathematica Sinica, Chinese Series . 1957, (4): 590 -630 .  DOI: 10.12386/A1957sxxb0040