@incollection{AST_1994__224__61_0,
     author = {Schapira, Pierre and Schneiders, Jean-Pierre},
     title = {Elliptic pairs {II.} {Euler} class and relative index theorem},
     booktitle = {Index theorem for elliptic pairs},
     series = {Ast\'erisque},
     pages = {61--98},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {224},
     year = {1994},
     mrnumber = {1305643},
     zbl = {0856.58039},
     language = {en},
     url = {http://www.numdam.org/item/AST_1994__224__61_0/}
}