1. 1G. ALMGREN, 1990 : Lvskog. Bjrk, asp och al i skogsbruk och naturvrd. Jnkping, Sweden: National Board of Forestry (in Swedish).
2. 2ANON. , 1988 : SAS/STAT User's Guide. Release 6.03 Edition. Cary, NC, USA: SAS Institute Inc.
3. 3ANON. , 1995 : Climate, lakes and rivers . In: National Atlas of Sweden. Stockholm: SNA Publishing.
4. 4ANON. , 1998 : Vder och vatten . Norrkping, Sweden: Swedish Meteorological and Hydrological Institute (in Swedish).