The quaternion formalism for Möbius groups in four or fewer dimensions von Wilker, J.B.

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Tiling R 3 with circles and disks von Wilker, J.B.

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(2)… by efficient cooperation von Wilker, J.B.

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Contributions to a General Theory of View-Obstruction Problems, II von Dumir, V.C., Hans-Gill, R.J., Wilker, J.B.

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The apollonian octets and an inversive form of Krause's theorem von Wilker, J.B.

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Topologically equivalent two-dimensional isometries von Wilker, J.B.

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Simplexes in spaces of constant curvature von Dekster, B.V., Wilker, J.B.

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Generalized symmetry von Wilker, J.B.

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Topologically equivalent N-dimensional isometries von Wilker, J.B.

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