author = {Eugen Ardeleanu},}
title = {{Relational Structures}},
number = {94-71},
year = {1994},
sponsor = { Austrian National Science Foundation project no. 6471 %9316 in the frame of},
type = {RISC Report Series},
institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},
address = {Altenberger Straße 69, 4040 Linz, Austria},
issn = {2791-4267 (online)}