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Flatwords and Post Correspondence Problem

Tero Harju, Marjo Lipponen and Alexandru Mateescu
Theoretical Computer Science 161 (1-2) 93 (1996)
DOI: 10.1016/0304-3975(95)00092-5
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Strongly prime PCP words

Marjo Lipponen and Gheorghe Päun
Discrete Applied Mathematics 63 (2) 193 (1995)
DOI: 10.1016/0166-218X(95)00064-X
See this article