@incollection{AST_1994__226__211_0,
     author = {Langer, Andreas},
     title = {On a specialization map in $K_2$-cohomology},
     booktitle = {$K$-theory - Strasbourg, 1992},
     series = {Ast\'erisque},
     pages = {211--233},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {226},
     year = {1994},
     mrnumber = {1317121},
     zbl = {0826.19002},
     language = {en},
     url = {http://www.numdam.org/item/AST_1994__226__211_0/}
}