Ching-Tien Ho, Rakesh Agrawal, et al.
SIGMOD Record (ACM Special Interest Group on Management of Data)
It is NP-complete to recognize whether two sets of points in general space can be separated by two hyperplanes. It is NP-complete to recognize whether two sets of points in the plane can be separated with k lines. For every fixed k in any fixed dimension, it takes polynomial time to recognize whether two sets of points can be separated with k hyperplanes. © 1988 Springer-Verlag New York Inc.
Ching-Tien Ho, Rakesh Agrawal, et al.
SIGMOD Record (ACM Special Interest Group on Management of Data)
Masakazu Kojima, Nimrod Megiddo, et al.
Mathematical Programming
Nimrod Megiddo, Ramakrishnan Srikant
KDD 1998
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Mathematical Programming, Series B