This book expresses the full understanding of Weyl's formula for the
volume of a tube, its roots and its implications. Historical notes and
Mathematica drawings have been added to this revised second edition.
From the reviews:
"Will do much to make Weyl's tube formula more accessible to modern
readers.... A high point is the presentation of estimates for the
volumes of tubes in ambient Riemannian manifolds whose curvature is
bounded above or below."
--BULLETIN OF THE AMS