Stratified sets
Structure theory of set addition, Astérisque, no. 258 (1999), 11 p. 
@incollection{AST_1999__258__205_0,
     author = {Nicolas, Jean-Louis},
     title = {Stratified sets},
     booktitle = {Structure theory of set addition},
     editor = {Deshouilliers Jean-Marc and Landreau Bernard and Yudin Alexander A.},
     series = {Ast\'erisque},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {258},
     year = {1999},
     zbl = {0978.11055},
     mrnumber = {1701199},
     language = {en},
     url = {archive.numdam.org/item/AST_1999__258__205_0/}
}
Nicolas, Jean-Louis. Stratified sets, dans Structure theory of set addition, Astérisque, no. 258 (1999), 11 p. http://archive.numdam.org/item/AST_1999__258__205_0/

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