A Mathematical Introduction to String Theory: Variational Problems, Geometric and Probabilistic Methods (London Mathematical Society Lecture Note Series)  Variational Problems, Geometric and Probabilistic Methods, Vol. 225  Sergio Albeverio, Jurgen Jost, Sylvie Paycha, Sergio Scarlatti (1997) 

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In this lecture note the authors give an introduction to certain global analytic and probabilistic aspects of string theory. It is their intention to bring together, and make explicit, the necessary mathematical tools. Researchers with an interest in string theory, in either mathematics or theoretical physics, will find this a stimulating volume. 

