1. Extending large sets of t-designs;Ajoodani-Namini;J. Combin. Theory A,1996
2. Extending t-designs;Alltop;J. Combin. Theory A,1975
3. The discovery of simple 7-designs with automorphism group PΓL(2,32);Betten,1995
4. Simple 8-designs with small parameters;Betten;De. Codes Cryptography,1998
5. Some simple 7-designs;Betten,1997