@incollection {BBGK2021,
    AUTHOR = {Bertrand, F. and Boffi, D. and Gedicke, J. and Khan, A.},
     TITLE = {Some Remarks on the a Posteriori Error Analysis of the Mixed Laplace Eigenvalue Problem},
 BOOKTITLE = {WCCM-ECCOMAS2020},
    SERIES = {Numerical Methods and Algorithms in Science and Engineering},
    VOLUME = {700},
     PAGES = {1--10},
 PUBLISHER = {Scipedia},
      YEAR = {2021},
       DOI = {10.23967/wccm-eccomas.2020.314},
       URL = {https://www.scipedia.com/public/Bertrand_et_al_2021a},
}