no. 3
Natural covers
Compositio Mathematica, Tome 21 (1969) no. 3, pp. 253-261. 
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     volume = {21},
     number = {3},
     year = {1969},
     mrnumber = {250252},
     zbl = {0188.27901},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1969__21_3_253_0/}
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Franklin, S. P. Natural covers. Compositio Mathematica, Tome 21 (1969) no. 3, pp. 253-261. http://archive.numdam.org/item/CM_1969__21_3_253_0/

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