O.F. · O.I. · O. I. Franksen
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| H C Ørsted: A Man of the Two Cultures. Experimenta Circa Effectum Conflictus Electrici in Acum Magneticam. | 978-87-87200-43-1 (87-87200-43-0) | 1981 |
| Mr. Babbage's Secret: The Tale of a Cypher and Apl | 978-0-13-604729-2 (0-13-604729-7) | 1985 |
| Mr. Babbages secret: The tale of a cypher and APL | 978-87-87200-86-8 (87-87200-86-4) | 1984 |