%% -*-BibTeX-*- @Article{GroetschelWakabayashi1989, author = "Martin Gr{\"o}tschel and Yoshiko Wakabayashi", title = "A cutting plane algorithm for a clustering problem", journal = "Mathematical Programming, Series B", volume = "45", organization = "59-96", publisher = "Mathematical Programming, Series B", pages = "59--96", year = "1989", language = "English", }