Extension HNN (French Wikipedia)

Analysis of information sources in references of the Wikipedia article "Extension HNN" in French language version.

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(en) Graham Higman, B. H. Neumann et Hanna Neumann, « Embedding Theorems for Groups », J. London Math. Soc., vol. s1-24, n^o 4,‎ 1949, p. 247–254 (DOI 10.1112/jlms/s1-24.4.247)