Unitary Integration: A Numerical Technique Preserving the Structure of the Quantum Liouville Equation
B. A. Shadwick and W. F. Buell
Phys. Rev. Lett. 79, 5189 (1997) - Published 29 December, 1997
Negative Entropy and Information in Quantum Mechanics
N. J. Cerf and C. Adami
Phys. Rev. Lett. 79, 5194 (1997) - Published 29 December, 1997