@article{10_4064_ap_44_2_201_207,
     author = {Pierre Henry Krief},
     title = {Sur les formes diff\'erentielles ferm\'ees \`a coefficients diff\'erentiables mais non contin\^ument diff\'erentiables},
     journal = {Annales Polonici Mathematici},
     pages = {201--207},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {1984},
     doi = {10.4064/ap-44-2-201-207},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-44-2-201-207/}
}