Critical point theory in global analysis and differential topology; an introduction [by] Marston Morse [and] Stewart S. Cairns. (Pure and applied mathematics; a series of monographs and textbooks ; 33)
Critical point theory in global analysis and differential topology; an introduction [by] Marston Morse [and] Stewart S. Cairns.
(Pure and applied mathematics; a series of monographs and textbooks ; 33)