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ISSN:1571-0661|50|3|1-28

Elsevier‎(2004)‎

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By Orejas F.   Pino E.   Ehrig H.   in Theoretical Computer Science

ISSN:0304-3975|173|2|485-511

Elsevier‎(1997)‎

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By Ehrig H.   Große-Rhode M.   Wolter U.   in Applied Categorical Structures

ISSN:0927-2852|6|1|1-35

Springer Publishing Company ‎(1998)‎

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