MathSciNet bibliographic data MR1500751 45K05 Bolza, Oskar A fifth necessary condition for a strong extremum of the integral $\int\sp {x\sb 1}\sb {x\sb 0} F(x,y,y')dx$$\int\sp {x\sb 1}\sb {x\sb 0} F(x,y,y')dx$. Trans. Amer. Math. Soc. 7 (1906), no. 2, 314–324. Article

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