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4. Appell P (1955) Traité de mécanique rationnelle, Tome V: «Eléments de calcul tensoriel: applications géométriques et mécaniques» by René Thiry. Gauthier-Villars, Paris; first edition 1926, second edition 1933; new printing 1955. (Editions Gabay, Paris, made the good move to reprint this together with the second edition (1935) of Volume IV in a facsimile reprint in 1991)
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