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The authors study the via assignment problem when vias are allowed to appear rowwise as well as columnwise. Previously they proved that the problem belongs to the class of NP-hard problems and therefore it is unlikely that polynomial-time algorithms exist for solving the problem. Two heuristics (HEU1 and HEU2) to solve the problem were proposed. HEU1 splits the nets before any routing is done w
two-dimensional via assignment; single-row routing; NP-hard problems; polynomial-time algorithms; HEU1; HEU2; circuit layout CAD; directed graphs; printed circuits.

H. Du, O. Ibarra and J. Naveda, "On Two-Dimensional Via Assignment for Single-Row Routing," in IEEE Transactions on Computers, vol. 37, no. , pp. 721-727, 1988.
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