On a perturbation expansion of the characteristic function of classical mechanics
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 7 (1967) no. 3, pp. 215-228. 
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     author = {Sen Gupta, N. D.},
     title = {On a perturbation expansion of the characteristic function of classical mechanics},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
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     number = {3},
     year = {1967},
     zbl = {0157.55501},
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     url = {http://archive.numdam.org/item/AIHPA_1967__7_3_215_0/}
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Sen Gupta, N. D. On a perturbation expansion of the characteristic function of classical mechanics. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 7 (1967) no. 3, pp. 215-228. http://archive.numdam.org/item/AIHPA_1967__7_3_215_0/

[1] H. Poincaré, Les méthodes nouvelles de la mécanique céleste, Gauthier-Villars Paris, 1895, t. I, chap. VI. | JFM

[2] (i) Ph. Frank'S article in Die Differential und Integral-gleichungen der Mechanik and Physik, edited by Ph. Frank and R. Mises, Braunschweig (1930), Band II, Chap. V; (ii) E. Fues' article in Handbuch der physik., Band V (1927).

[3] G. Pranges, article in Encykloadie der Mathematischen Wissenschaften, Band IV, Mechanik, Tauber, Leipzing und Berlin (1935).

[4] Max Born, The Mechanics of the Atom, Fredercik Ungar Publishing Co. New York (republished 1960), Chap. IV.