@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}}