| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Every Planar Map Is Four Colorable | 978-O-8218-51O3-6 (O-8218-51O3-9) | 1989 | Kenneth Appel |
W H · Wolfganag Hageney · Wolfgang Hagen · Wolfgang Hageney · Wolfgang Hagenney · Wolfgang Hausen · Wolfgang Hegeney · Wolfgang Heuschen