@article{ASNSP_1997_4_25_1-2_131_0, author = {Boffi, Daniele and Brezzi, Franco and Gastaldi, Lucia}, title = {On the convergence of eigenvalues for mixed formulations}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {131--154}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 25}, number = {1-2}, year = {1997}, zbl = {1003.65052}, mrnumber = {1655512}, language = {en}, url = {http://archive.numdam.org/item/ASNSP_1997_4_25_1-2_131_0/} }