| |
| 1991 | ||
|---|---|---|
| 2 | EE | H. Zeitler: About special classes of Steiner systems S(2, 4, upsilon). Discrete Mathematics 97(1-3): 399-407 (1991) |
| 1989 | ||
| 1 | EE | H. Zeitler: Modifications of the "central-method" to construct Steiner triple systems. Discrete Mathematics 77(1-3): 367-384 (1989) |