@Book{lans1989sql, author = {Lans, R.F. van der}, title = {SQL in dBASE IV : ein Handbuch}, publisher = {Addison-Wesley}, year = {1989}, address = {Bonn u.a}, isbn = {3893192409}, lang = {de}, sign = {11/00085}, gbv = {54.64}, rvk = {}, url = {}, thumb = {} }