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Dedicated to the memory of my good friend and colleague Peter Stefan
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Huebschmann, J. Aspherical 2-complexes and an unsettled problem of J. H. C. Whitehead. Math. Ann. 258, 17–37 (1981). https://doi.org/10.1007/BF01450344
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DOI: https://doi.org/10.1007/BF01450344