...we consider this book to be a valuable contribution to present mathematics.It is useful primarily for researchers in the field but it may just as ell beused ... » 

...we consider this book to be a valuable contribution to present mathematics.It is useful primarily for researchers in the field but it may just as ell beused by students of mathematics mechanics or physics and by anybodyinterested in the modern applications of geometry and topology. ActaApplicandae Mathematicae 28 1992 «