Karel Culik II. Small Aperiodic Sets of Triangular and Hexagonal Tiles. In Juhani Karhumäki, Hermann A. Maurer, Gheorghe Paun, Grzegorz Rozenberg, editors, Jewels are Forever, Contributions on Theoretical Computer Science in Honor of Arto Salomaa. pages 307-313, Springer, 1999.
Abstract is missing.