The following publications are possibly variants of this publication:
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- Error Estimates and Superconvergence of Mixed Finite Element Methods for Convex Optimal Control ProblemsYanping Chen, Yunqing Huang, Wenbin Liu, Ningning Yan. jscic, 42(3):382-403, 2010. [doi]
- ∞-estimates of mixed finite element methods for general nonlinear optimal control problemsYanping Chen 0002, Zuliang Lu. jossac, 25(1):105-120, 2012. [doi]