@BOOK{aschur,
author = {Hans Brox and Wolf-Dietrich Walker},
title = {Allgemeines Schuldrecht},
language = {ngerman},
edition = {29.},
year = 2003,
address = {M\"unchen}}
@BOOK{bschur,
author = {Hans Brox and Wolf-Dietrich Walker},
title = {Besonderes Schuldrecht},
shorttitle = {BSchuR},
language = {ngerman},
edition = {27.},
year = 2002,
address = {M\"unchen}}