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Received: 27 April 1998 / in final form: 23 October 1998
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Dupont, N., Hess, K. Noncommutative algebraic models for fiber squares. Math Ann 314, 449–467 (1999). https://doi.org/10.1007/s002080050302
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DOI: https://doi.org/10.1007/s002080050302