@article{CM_1996__101_2_179_0,
     author = {Zung, Nguyen Tien},
     title = {Symplectic topology of integrable hamiltonian systems, {I} : {Arnold-Liouville} with singularities},
     journal = {Compositio Mathematica},
     pages = {179--215},
     publisher = {Kluwer Academic Publishers},
     volume = {101},
     number = {2},
     year = {1996},
     mrnumber = {1389366},
     zbl = {0936.37042},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1996__101_2_179_0/}
}