1. Betonghandbok material . (1994). Svensk Byggtjänst Stockholm Sweden (in Swedish).
2. Byfors J. (1980). “Plain concrete at early ages.” CBI Research 3:80 Swedish Cement and Res. Inst. Stockholm Sweden.
3. Jones R. (1962). Non-destructive testing of concrete . Cambridge University Press London England.
4. Nagy A. (1994). “Cracking of concrete structures due to early thermal deformations.” Rep. TVBK-1009 Dept. of Struct. Engrg. Lund Inst. of Technol. Lund Sweden.