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[BF] T. Bonnesen, W. Fenchel: Theorie der konvexen Körper, Ber. Reprint, Springer-Verlag, 1974.

[CM] W. Cieslak, W. Mozgawa: On rosettes and almost rosettes, Geom. Dedicata 24 (1987), 221-228.

[CR1] F.J. Craveiro de Carvalho, S.A. Robertson: The parallel group of a plane curve, (to appear).

[CR2] F.J. Craveiro de Carvalho, S.A. Robertson: Self-parallel curves, Math. Scand. 65 (1989), 67-74.

[FR] H.R. Farran, S.A. Robertson: Parallel immersions in Euclidean space, J. London Math. Soc. (2) 35 (1987), 527-538.

[I] M.C. Irwin: Transnormal circles. J. London Math. Soc. 42 (1967), 545-552.

[MW] T.F. Mersal; B. Wegner: Variation of the total normal twist of closed curves in Euclidean spaces, Proceedings Conf. on Geometry and Topology, Braga 1997 (to appear).

[R1] S.A. Robertson: Generalized constant width for manifolds. Michigan Math. J. 11 (1964), 97-105.

[W1] B. Wegner: Some global properties and constructions for closed curves in the plane, Geom. Dedicata 29 (1989), 317-326.

[W2] B. Wegner: Some remarks on parallel immersions, Coll. Math. Soc. J. Bolyai 56 (1989 /1991), 707-717.

[W3] B. Wegner: Self-parallel and transnormal curves, Geom. Dedicata 38 (1991), 175-191.

[W4] B. Wegner: Globale Sätze über Raumkurven konstanter Breite I,II, Math. Nachr. 53 (1972), 337-344, ibid. 67 (1975), 213-223.

[W5] B. Wegner: Exterior parallelism for polyhedra, Math. Pannonica 2 (1991), 95-106.

[W6] B. Wegner: Self-parallel polygons and polyhedra, Geometry, Proc. Conf. Thessaloniki / Greece (1991), 444-451.

All files translated from TEX by TTH, version 1.0.
Received: 23.11.1998.