@article{RCM_2013_47_2_a5,
     author = {Felipe Ponce and Leonid Lebedev and Leonardo Rendon},
     title = {On {Weak} {Solvability} of {Boundary} {Value} {Problems} for {Elliptic} {Systems}},
     journal = {Revista colombiana de matematicas},
     pages = {191--204},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/RCM_2013_47_2_a5/}
}