This volume of the Encyclopaedia contains two articles which givea survey of modern research into non-regular Riemannian geometry,carried out mostly by Russian athematicians.

Both parts cover topics which have not yet been treated inmonograph form. Hence the book will be immensely useful tograduate students and researchers in geometry, in particularRiemannian geometry.

I. Two-Dimensional Manifolds of Bounded Curvatur,

Yu.G. Reshetnyak

II. Multidimensional Generalized Riemannian Spaces

V.N. Berestovskij, I.G. Nikolaev

Author Index

Subject Index