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2. G. Sewell,Quantum Theory of Collective Phenomena (Clarendon Press, Oxford, 1986), p. 20.
3. K. K. Wan, I. McKenna, and T. Jackson,Nuovo Cimento B 81, 165 (1984); K. K. Wan,Found. Phys. 18, 887 (1988).
4. Y. Matsushima,Differentiable Manifolds (Marcel Dekker, New York, 1972), p. 79; L. Loomis and S. Sternberg,Advanced Calculus (Addison-Wesley, Reading, Massachusetts, 1968), p. 376.
5. L. Loomis and S. Sternberg, ?loc. cit. pp. 517 and 520; R. Abraham and J. Marsden,Foundations of Mechanics (Benjamin/Cummings, Reading, Massachusetts, 1978), p. 242.