The geometry of the heat equation
Compositio Mathematica, Tome 12 (1954-1956), pp. 147-156. 
@article{CM_1954-1956__12__147_0,
     author = {Ingraham, Richard L.},
     title = {The geometry of the heat equation},
     journal = {Compositio Mathematica},
     pages = {147--156},
     publisher = {Kraus Reprint},
     volume = {12},
     year = {1954-1956},
     mrnumber = {68714},
     zbl = {0057.32701},
     language = {en},
     url = {http://www.numdam.org/item/CM_1954-1956__12__147_0/}
}
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Ingraham, Richard L. The geometry of the heat equation. Compositio Mathematica, Tome 12 (1954-1956), pp. 147-156. http://www.numdam.org/item/CM_1954-1956__12__147_0/