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Höppner, M. (1982). On the freeness of Whitehead-diagrams. In: Kamps, K.H., Pumplün, D., Tholen, W. (eds) Category Theory. Lecture Notes in Mathematics, vol 962. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0066892
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DOI: https://doi.org/10.1007/BFb0066892
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