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11. A. Sen, B. Zwiebach, A proof of local background independence of classical closed string field
theory. Nucl. Phys. B 414(3), 649–711 (1994). https://doi.org/10.1016/0550-3213(94)902585. arXiv: hep-th/9307088
12. A. Sen, B. Zwiebach, Quantum background independence of closed string field theory. Nucl.
Phys. B 423(2–3), 580–630 (1994). https://doi.org/10.1016/0550-3213(94)90145-7. arXiv:
hep-th/9311009
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Commun. Math. Phys. 177(2), 305–326 (1996). https://doi.org/10.1007/BF02101895. arXiv:
hep-th/9408053
14. H. Sonoda, Connection on the theory space (1993). arXiv:Hep-Th/9306119
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5473 (1992). https://doi.org/10.1103/PhysRevD.46.5467. arXiv: hep-th/9208027
