@inbook{inbookbe7d9f48,
title   = {Topics in 2d-gravity},
author = {Abdalla, Elcio and Abdalla, M C B and Gamboa, J and Zadra, A},
year = {1992},
publisher = {World Scientific},
journal   = {Proceedings of the 20th International Conference on Differential Geometric Methods in Theoretical Physics}
}