E.g., see (Di Battista & Tamassia 1988) and (Freese 2004). Di Battista, G.; Tamassia, R. (1988), "Algorithms for plane representation of acyclic digraphs", Theoretical Computer Science, 61 (2–3): 175–178, doi:10.1016/0304-3975(88)90123-5. Freese, Ralph (2004), "Automated lattice drawing", Concept Lattices, Lecture Notes in Computer Science, 2961, Springer-Verlag, hlm. 589–590. An extended preprint is available online: .