A. Martin: "A polynomially solvable case of the separation problem for the Steiner partition inequalities", Methods of Operations Research, vol. 62, pp. 277 – 284, 1990.
Bibtex Entry:
@Article{Martin90,
author = "A.~Martin",
title = "A polynomially solvable case of the separation problem
for the {S}teiner partition inequalities",
journal = "Methods of Operations Research",
year = "1990",
volume = "62",
pages = "277 -- 284",
}