Bg. Konopelchenko et G. Landolfi, One-loop analysis of QCD strings world sheets in R-4 through a Weierstrass-type representation, INT J MOD P, 16(15), 2001, pp. 2691-2707
Rigid string world sheets in R-4 are described by means of a representation
of the Weierstrass type. Correlators for the full rigid string action in t
he one-loop approximation over minimal backgrounds are calculated.