The expression for the force between two parallel screw dislocations i
s derived in the framework of the Yang-Mills-type gauge theory of disl
ocations earlier proposed by Kadic and Edelen [A gauge theory of dislo
cations and disclinations (Springer, Berlin, 1983)] and later develope
d by Valsakumar and Sahoo [Bull. Mater. Sci. 10 (1988) 3].