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4. Bahri, A.: Classical and Quantic Periodic Motions of Multiply Polarized Spin-Manifolds. Pitman Research Notes in Mathematics Series, vol. 378, Longman/Addison-Wesley, London/Reading (1998)
5. Bahri, A.: A Lagrangian Method for the Periodic Orbit Problem of Reeb Vector-Fields. Lecture Notes of Seminario Interdisciplinare di Matematica, vol. 7. Potenza, pp. 1–19 (2008)