Period Doubling and Chaotic Behavior in a Driven Anharmonic Oscillator
Paul S. Linsay
Phys. Rev. Lett. 47, 1349 (1981) - Published 9 November, 1981
Time-Dependent Variational Principle for Predicting the Expectation Value of an Observable
Roger Balian and Marcel Vénéroni
Phys. Rev. Lett. 47, 1353 (1981) - Published 9 November, 1981