1. A.V. Aho, M.R. Garey and J.D. Ullman (1972) ‘The transitive reduction of a directed graph’, SIAM J. Comput. 1, 131–137
2. A.V. Aho, J.E. Hopcroft and J.D. Ullman (1975) The Design and Analysis of Computer Algorithms, Addison-Wesley, Reading, Ma.
3. M.D. Atkinson (1989) ‘The complexity of orders’, this volume
4. M.D. Atkinson and H.W. Chang (1986) ‘Extensions of partial orders of bounded width’, Congressus Num. 52, 21–35
5. K.A. Baker, P.C. Fishburn and F.S. Roberts (1971) ‘Partial orders of dimension 2’ Networks 2, 11–28