Ola Angelsmark,
Vilhelm Dahllöf,
and Peter Jonsson
Proc. 27th Int. Symp. Mathematical Foundations of Computer Science (MFCS 2002), Lecture Notes in Computer Science 2420, Krzysztof Diks
and Wojciech Rytter, ed., Springer-Verlag, 2002, pp. 93–103
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