References
- Gorbatschev , R. 1961 . The dolerites of the Eskilstuna region. . Sveriges geologiska undersökning. , C : 580
- Hodder , I. 1982 . Symbols in Action , Cambridge University Press .
- Hulthen , B. and Welinder , S. 1981 . A Stone Age Economy , Stockholm : Akademilitteratur .