@article{RSMUP_2004__111__133_0,
     author = {Otway, Thomas H.},
     title = {Maps and fields with compressible density},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {133--159},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {111},
     year = {2004},
     mrnumber = {2076737},
     zbl = {1121.76056},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_2004__111__133_0/}
}