Geodesic
A differential-variational equation
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 21 (1966) no. 5 
I. M. Koval'chik. A differential-variational equation. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 21 (1966) no. 5. http://geodesic.mathdoc.fr/item/RM_1966_21_5_a20/
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     author = {I. M. Koval'chik},
     title = {A~differential-variational equation},
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     url = {http://geodesic.mathdoc.fr/item/RM_1966_21_5_a20/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] S. Tomonaga, “Relyativistski invariantnaya formulirovka kvantovoi teorii volnovykh polei”, Noveishee razvitie kvantovoi elektrodinamiki, IL, M., 1954, 1–11

[2] V. Volterra, “Sopra le funzioni che dipendono da altre funzioni”, Rend. Realle Accad. Lincei, 3 (1887), 97–105

[3] N. Wiener, “The average value of a functional”, Proc. London Math. Soc., 22:6 (1924), 454–467 | DOI | MR | Zbl