@article{700133,
     title = {Mixed finite element in 3D in $H(\operatorname{div})$ and $H(\operatorname{curl})$
               },
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {[321]-325},
     mrnumber = {MR0877143},
     zbl = {0603.65069},
     url = {http://dml.mathdoc.fr/item/700133}
}

Nédélec, Jean-Claude. Mixed finite element in 3D in $H(\operatorname{div})$ and $H(\operatorname{curl})$
               , dans Equadiff 6, GDML_Books,  (1986), pp. [321]-325. http://gdmltest.u-ga.fr/item/700133/