Template:Morse1931
From Manifold Atlas
M. Morse, The critical points of a function of variables., Trans. Am. Math. Soc. 33 (1931), 72-91. Zbl 0001.33103
M. Morse, The critical points of a function of variables., Trans. Am. Math. Soc. 33 (1931), 72-91. Zbl 0001.33103