@article{CRMATH_2005__340_12_879_0,
     author = {Mardare, Sorin},
     title = {On {Pfaff} systems with $ {L}^{p}$ coefficients in dimension two},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {879--884},
     publisher = {Elsevier},
     volume = {340},
     number = {12},
     year = {2005},
     doi = {10.1016/j.crma.2005.05.013},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2005.05.013/}
}