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Marmo, G and Mukunda, N (1986) Symmetries and constants of the motion in the Lagrangian formalism on $TQ$: beyond point transformations. In: Il Nuovo Cimento - B, 92 (1). pp. 1-12.
Bhatnagar, PL and Sachdev, PL (1966) Propagation of an isothermal shock in stellar envelopes. In: Il Nuovo Cimento - B, 44 (1). pp. 15-30.
