1. American Society for Testing Materials ASTM E112-88 Standard Methods for determining the average grain size, 1988.
2. British Standard Institution-BSI 7591: part 1, 1992.
3. Interim and final reports produced by ISQ under EU funded project BRITE EURAM BE 2486—Recognition and processing of indigenous industrial materials by laser.
4. Laser Materials Processing;Steen,1993
5. Laser cutting;Steen,1983