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Methodus inveniendi lineas curvas maximi minimive proprietate gaudentes, sive, Solutio problematis isoperimetrici latissimo sensu accepti (1744)
Euler, Leonhard, 1707-1783, Daudet, Robert, Delamonce, Ferdinand Pierre Joseph Ignace, 1678-1753, Dibner, Bern, donor · Lausannæ ; Genevæ : Apud Marcum-Michaelem Bousquet & Socios · leaf 279

Calculus of variations
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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