no. S4
Eigenvalue Approximation via Non-Conforming and Hybrid Finite Element Methods
Publications mathématiques et informatique de Rennes, no. S4 (1978), article no. 10, 16 p. 
@article{PSMIR_1978___S4_A10_0,
     author = {Mercier, Bertrand and Rappaz, J.},
     title = {Eigenvalue Approximation via Non-Conforming and Hybrid Finite Element Methods},
     journal = {Publications math\'ematiques et informatique de Rennes},
     eid = {10},
     publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes},
     number = {S4},
     year = {1978},
     language = {en},
     url = {www.numdam.org/item/PSMIR_1978___S4_A10_0/}
}
Mercier, B.; Rappaz, J. Eigenvalue Approximation via Non-Conforming and Hybrid Finite Element Methods. Publications mathématiques et informatique de Rennes, no. S4 (1978), article  no. 10, 16 p. http://www.numdam.org/item/PSMIR_1978___S4_A10_0/

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