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• First Order System of Equations of Mixed Type and Second Order Equation of Mixed Type

  Sun Hesheng

  1993-06-01

  39063 2646 Pages:155-163

• On a Maximum Principle and Uniqueness Theorems for a System of First Order Equations of Mixed Type

  Hesheng Sun, Yongqian Han

  1996-09-01

  38156 2831 Pages:251-262

• Modified Tricomi Problem for a Nonlinear System of Second Order Equations of Mixed Type

  Hesheng Sun

  1999-12-01

  39245 3064 Pages:106-110