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Fritz Grunewald: Deceased
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Bessa, V., Grunewald, F. & Zalesskii, P.A. Genus for virtually surface groups and pullbacks. manuscripta math. 145, 221–233 (2014). https://doi.org/10.1007/s00229-014-0677-7
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DOI: https://doi.org/10.1007/s00229-014-0677-7