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Howson A. G., 1954, J LOND MATH SOC, Vs1-29, P428, DOI 10.1112/jlms/s1-29.4
[4]
IMRICH W, 5TH P AUSTR C COMB M
[5]
NEUMANN H, 1956, PUBL MATH DEBR, V0005, P00186
[6]
TRETKOFF M, TO BE PUBLISHED
[7]
[No title captured]