Olof Hanner's Jigsaw Puzzle
According to Hubert Shutrick, a variant of K. O. Friedrichs' tessellation is known in some circles as Hanner's Jigsaw Puzzle, with a reference to Professor Olof Hanner. [Frederickson, p. 34] refers to it as an "uncentered Perigal's dissection".
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- G. N. Frederickson, Dissections: Plane & Fancy, Cambridge University Press, 1997