@article {Diamandis:1991ug,
	title = {{The Effect of the 2-D gravity to the Beta functions of a nonlinear sigma model}},
	journal = {Phys. Lett. B},
	volume = {277},
	year = {1992},
	pages = {398{\textendash}404},
	doi = {10.1016/0370-2693(92)91801-F},
	author = {Diamandis, G. A. and Georgalas, B. C. and Lahanas, A.B. and Papantonopoulos, E.}
}
