@article{PORMA_1999__56_4_49027,
     author = {Phan, T. and Natividade, M.},
     title = {Clinic obstructions and clinic cohomological groups.},
     journal = {Portugaliae mathematica},
     pages = {381--387},
     publisher = {mathdoc},
     volume = {56},
     number = {4},
     year = {1999},
     zbl = {0978.20024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1999__56_4_49027/}
}