"2.1" . "BV4.1"@en . . . . "The application software BV4.1 is an easy-to-use tool for decomposing and seasonally adjusting monthly or quarterly economic time series by version 4.1 of the so-called Berlin procedure. It is being developed by the Federal Statistical Office of Germany. The software is released as freeware for non-commercial purposes."@en . . . . . . . .