Helmut Siemon Cyclic Steiner Quadruple Systems and Köhler's Orbit Graphs. [Citation Graph (0, 0)][DBLP] Des. Codes Cryptography, 1991, v:1, n:2, pp:121-132 [Journal]

Helmut Siemon Piotrowski's Infinite Series of Steiner Quadruple Systems Revisited. [Citation Graph (0, 0)][DBLP] Des. Codes Cryptography, 1996, v:8, n:1-2, pp:239-254 [Journal]

Helmut Siemon A Number Theoretic Conjecture and the Existence of S-Cyclic Steiner Quadruple Systems. [Citation Graph (0, 0)][DBLP] Des. Codes Cryptography, 1998, v:13, n:1, pp:63-94 [Journal]

Helmut Siemon On the existence of cyclic Steiner Quadruple systems SQS (2p). [Citation Graph (0, 0)][DBLP] Discrete Mathematics, 1991, v:97, n:1-3, pp:377-385 [Journal]

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