John R. Kender, Rick Kjeldsen
IEEE Transactions on Pattern Analysis and Machine Intelligence
We show that the semilattice extension problem raised by Arbib and Manes in [2] is NP-hard, implying that no simple solution is likely to be forthcoming. © 1983 Birkhäuser Verlag.
John R. Kender, Rick Kjeldsen
IEEE Transactions on Pattern Analysis and Machine Intelligence
Peter Wendt
Electronic Imaging: Advanced Devices and Systems 1990
A. Gupta, R. Gross, et al.
SPIE Advances in Semiconductors and Superconductors 1990
M. Shub, B. Weiss
Ergodic Theory and Dynamical Systems