中国科学院数学与系统科学研究院期刊网
AMS
Three Kinds of Darboux Transformation for the Evolution Equations Which Connect with A.K.N.S. Eigenvalue Problem
Li Yishen, Gu Xinshen, Zou Maorong
Acta Mathematica Sinica . 1987, (2): 143 -151 .  DOI: 10.1007/BF02565027