References

HAVER ANALYTICS (2001), DLX API Programmer’s Reference, New York, NY. 10165 [http://www.haver.com/]

HAVER ANALYTICS (2005), DLX Database Profile, New York, NY. 10165

HAVER ANALYTICS (2005), DATA LINK EXPRESS, Time Series Data Base Management System, New York, NY. 10165 [http://www.haver.com/]