@article{JAC_2012__35_4_a1,
     author = {Orel, Marko},
     title = {Adjacency preservers, symmetric matrices, and cores},
     journal = {Journal of Algebraic Combinatorics},
     pages = {633--647},
     publisher = {mathdoc},
     volume = {35},
     number = {4},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2012__35_4_a1/}
}