Carlo Blundo, Paolo D Arco, Alfredo De Santis, Douglas R. Stinson. Contrast Optimal Threshold Visual Cryptography Schemes. SIAM J. Discrete Math., 16(2):224-261, 2003. [doi]
@article{BlundoDSS03,
title = {Contrast Optimal Threshold Visual Cryptography Schemes},
author = {Carlo Blundo and Paolo D Arco and Alfredo De Santis and Douglas R. Stinson},
year = {2003},
url = {http://epubs.siam.org/sam-bin/dbq/article/33668},
researchr = {https://researchr.org/publication/BlundoDSS03},
cites = {0},
citedby = {0},
journal = {SIAM J. Discrete Math.},
volume = {16},
number = {2},
pages = {224-261},
}