2015
Moduli Spaces of Riemannian Metrics Book
Birkhäuser Basel, 2015, ISBN: 978-3-0348-0947-4, (Softcover).
1975
Comparison Theorems in Riemannian Geometry Book
Reprinting, 2008, AMS Chelsea Publishing, American Mathematical Society - Providence, Rhode Island, 1975, ISBN: 978-0-8218-4417-5, (Hardcover. Originally published: Amsterdam : North-Holland Pub. Co. ; New York : American Elsevier Pub. Co., 1975, in series: North-Holland mathematical library ; v.9.).