The following publications are possibly variants of this publication:
- Characterization and Complexity of Uniformly Non Primitive Labeled 2-StructuresJoost Engelfriet, Tero Harju, Andrzej Proskurowski, Grzegorz Rozenberg. TCS, 154(2):247-282, 1996. [doi]
- Labeled 2-StructuresGrzegorz Rozenberg. BIRTHDAY 1991: 268-282
- Partial (Set) 2-Structures. Part I: Basic Notions and the Representation ProblemAndrzej Ehrenfeucht, Grzegorz Rozenberg. ACTA, 27(4):315-342, 1989.
- Partial (Set) 2-Structures. Part II: State Spaces of Concurrent SystemsAndrzej Ehrenfeucht, Grzegorz Rozenberg. ACTA, 27(4):343-368, 1989.
- Theory of 2-Structures, Part II: Representation Through Labeled Tree FamiliesAndrzej Ehrenfeucht, Grzegorz Rozenberg. TCS, 70(3):305-342, 1990.