Douglas S. Shafer

Complete integrability and time-reversibility of some 3-dim systems

Valery G. Romanovski, Douglas S. Shafer, 2016, Appl. Math. Lett..

The 1: -q resonant center problem for certain cubic Lotka-Volterra systems

Jaume Giné, Valery G. Romanovski, Douglas S. Shafer, 2012, Appl. Math. Comput..

1: -3 resonant centers on C2 with homogeneous cubic nonlinearities

Valery G. Romanovski, Douglas S. Shafer, Zhaoping Hu, 2008, Comput. Math. Appl..

The Center Problem

Valery G. Romanovski, Douglas S. Shafer, 2009 .

The Isochronicity and Linearizability Problems

Valery G. Romanovski, Douglas S. Shafer, 2009 .

Symbolic computation and the cyclicity problem for singularities

Douglas S. Shafer, D. Shafer, 2012, J. Symb. Comput..

Time-Reversibility in Two-Dimensional Polynomial Systems

Valery G. Romanovski, Douglas S. Shafer, 2005 .

Nonlinear Dynamics and Chaos: With Applications to Physics, Biology, Chemistry, and Engineering (Steven H. Strogatz)

Douglas S. Shafer, 1995, SIAM Rev..