@article {MR2796151,
	title = {Convergence of the mimetic finite difference method for eigenvalue problems in mixed form},
	journal = {Comput. Methods Appl. Mech. Engrg.},
	volume = {200},
	number = {9-12},
	year = {2011},
	pages = {1150{\textendash}1160},
	issn = {0045-7825},
	doi = {10.1016/j.cma.2010.06.011},
	url = {https://doi.org/10.1016/j.cma.2010.06.011},
	author = {Andrea Cangiani and Gardini, Francesca and Manzini, Gianmarco}
}
