@article{PIM_1985_N_S_37_51_a20,
     author = {J.M. Hernando and E. Reyes and P.M. Gadea},
     title = {Integrability of {Tensor} {Structures} of {Electromagnetic} {Type}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {113 },
     publisher = {mathdoc},
     volume = {_N_S_37},
     number = {51},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1985_N_S_37_51_a20/}
}