@article{10_4064_sm_22_1_91_107,
     author = {H. Marcinkowska},
     title = {On the differentiability of weak solutions of certain non-elliptic equations},
     journal = {Studia Mathematica},
     pages = {91--107},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1962},
     doi = {10.4064/sm-22-1-91-107},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-22-1-91-107/}
}