@article{RCM_2013_47_1_a1,
     author = {Juan Carlos Hern\'andez R.},
     title = {Existence of {Weak} {Entropy} {Solution} for a {Symmetric} {System} of {Keytz-Kranzer} {Type}},
     journal = {Revista colombiana de matematicas},
     pages = {13--28},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/RCM_2013_47_1_a1/}
}