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• The Periodic Boundary Problem and the Initial Value Problem for a Nonlinear System of Equations of Changing Type

  Han Yongqian, Sun Hesheng

  2020-05-12

  39522 2552 Pages:373-384

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

  Hesheng Sun & Yongqian Han

  1996-09-01

  38115 2802 Pages:251-262