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- [4] SUB-COVERINGS OF PLANES BY CIRCLES JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1969, 236 : 145 - &
- [5] SLIP CIRCLES AND CRITICAL SHEAR PLANES JOURNAL OF THE GEOTECHNICAL ENGINEERING DIVISION-ASCE, 1981, 107 (07): : 929 - 942
- [9] DISJOINT CIRCLES IN FINITE MIQUELIAN INVERSIVE PLANES NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (01): : A200 - A200