Maps and fields with compressible density
Rendiconti del Seminario Matematico della Università di Padova, Tome 111 (2004), pp. 133-159. 
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     author = {Otway, Thomas H.},
     title = {Maps and fields with compressible density},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {133--159},
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     volume = {111},
     year = {2004},
     mrnumber = {2076737},
     zbl = {1121.76056},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2004__111__133_0/}
}
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Otway, Thomas H. Maps and fields with compressible density. Rendiconti del Seminario Matematico della Università di Padova, Tome 111 (2004), pp. 133-159. http://www.numdam.org/item/RSMUP_2004__111__133_0/

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