Nr. 653
Extended rotational ellipsoid with 3 geodetic lines
Row: 1

Nr. 225
Areas and curves of constant width and constant perimeter
Row: 2

Nr. 226
Areas and curves of constant width and constant perimeter
Row: 2

Nr. 228
Areas and curves of constant width and constant perimeter
Row: 2

Nr. 231
Curve of constant width
Row: 2

Nr. 232
Curve of constant width
Row: 2

Nr. 233
Curve of constant width
Row: 2

Nr. 416
Rotational surfaces of constant negative curvature
Row: 3

Nr. 381
Minimal surface of 9. order (Enneper) with curvature lines
Row: 4

Nr. 414
Minimal surface with lemniscate as geodetic line
Row: 4