@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 = {}
}