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![Cover for A.A. Ungar · Hyperbolic Triangle Centers: The Special Relativistic Approach - Fundamental Theories of Physics (Paperback Book) [2010 edition] (2012)](https://imusic.b-cdn.net/images/item/original/650/9789400732650.jpg?a-a-ungar-2012-hyperbolic-triangle-centers-the-special-relativistic-approach-fundamental-theories-of-physics-paperback-book&class=scaled&v=1603947527)
![Cover for A.A. Ungar · Beyond the Einstein Addition Law and its Gyroscopic Thomas Precession: The Theory of Gyrogroups and Gyrovector Spaces - Fundamental Theories of Physics (Paperback Book) [New edition] (2001)](https://imusic.b-cdn.net/images/item/original/530/9781402003530.jpg?a-a-ungar-2001-beyond-the-einstein-addition-law-and-its-gyroscopic-thomas-precession-the-theory-of-gyrogroups-and-gyrovector-spaces-fundamental-theories-of-physics-paperback-book&class=scaled&v=1420455918)