Number | Name | Date | Kind |
---|---|---|---|
4133152 | Penrose | Jan 1979 | |
4350341 | Wallace | Sep 1982 |
Entry |
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"Escher and The Visual Representation of Mathematical Ideas" in M. C. Escher: Art and Science, by R. Penrose, H.S.M. Coxeter et al. eds. North-Holland, Dec. 1986. |