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"Steiner triple systems of order 19 and 21 with subsystems of order 7."
Petteri Kaski et al. (2008)
- Petteri Kaski, Patric R. J. Östergård, Svetlana Topalova
, Rosen Zlatarski:
Steiner triple systems of order 19 and 21 with subsystems of order 7. Discret. Math. 308(13): 2732-2741 (2008)

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