The following publications are possibly variants of this publication:
- Determining The Optimal Contrast For Secret Sharing Schemes In Visual CryptographyMatthias Krause, Hans-Ulrich Simon. cpc, 12(3):285-299, 2003.
- Determining the Optimal Contrast for Secret Sharing Schemes in Visual CryptographyMatthias Krause, Hans-Ulrich Simon. latin 2000: 280-291
- Contrast-Optimal k out of n Secret Sharing Schemes in Visual CryptographyThomas Hofmeister, Matthias Krause, Hans-Ulrich Simon. cocoon 1997: 176-185
- Contrast-optimal k out of n secret sharing schemes in visual cryptographyThomas Hofmeister, Matthias Krause, Hans-Ulrich Simon. TCS, 240(2):471-485, 2000. [doi]
- Construction of visual secret sharing schemes with almost optimal contrastChristian Kuhlmann, Hans-Ulrich Simon. soda 2000: 263-272 [doi]