"E. K." · Elmar Keck · Elmar Keij · Elmar Kos
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Matematikai kincsek Bolyai János: Kéziratos hagyatékából | 978-963-05-7612-3 | 1999 | Elemér Kiss |
| Matematikai kincsek Bolyai János: Kéziratos hagyatékából | 978-963-9132-43-6 | 1999 | " |
| Mathematical Gems from the Bolyai Chests: Janos Bolyai's Discoveries in Number Theory and Algebra As Recently Deciphered from His Manuscripts | 978-963-05-7563-8 | 1999 | Janos Bolyai |
| Mathematical Gems from the Bolyai Chests: Janos Bolyai's Discoveries in Number Theory and Algebra As Recently Deciphered from His Manuscripts | 978-963-9132-21-4 | 1999 | " |