References
Iden, O.: ‘Natural Bases for Subplanes of Free Completions’, Math. Z. 138 (1974), 97–109.
Joussen, J. and Liersch, A.: ‘Über die zu F 4 isomorphen Unterebenen einer freien Ebene’, Geom. Dedicata 11 (1981), 465–474.
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Iden, O. On the embeddings of F 4 in a free plane. Geom Dedicata 17, 131–132 (1984). https://doi.org/10.1007/BF00151499
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DOI: https://doi.org/10.1007/BF00151499