9DS 410:2004,Code of Practice for Loads for the Design of Structure.Charlott Enlund:Technical Commiffee DK,2004
10CEN EN1991-1-1:2002.Eurode 1:Actions on Strucfures-Part 1-1:General Actions-Densities,Self-Weight,Imposed Loads for Buildings.Brussel:European Committee for Standardization.2002