Abstract
In this work we present a modified mixed formulation for some three-field problems. Under a special hypothesis the modified formulation is such that: the verification of two (BB) conditions is avoided and one has to deal only with one, and the new problem has exactly the same solution as the old one.
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Wakrim, M., Ghadi, F. On some three-field mixed systems. Numerical Algorithms 21, 367–375 (1999). https://doi.org/10.1023/A:1019125900748
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DOI: https://doi.org/10.1023/A:1019125900748