Schneider, T., and A. Neumaier, 2001: Algorithm 808: ARfit — A Matlab package for the estimation of parameters and eigenmodes of multivariate autoregressive models. (climate-dynamics.org)
The researchers say that higher eigenmodes show more complex vibrational shapes compared to sub-resonance vibrations. (nanotechweb.org)
pdf See also commentary on experimental work confirming the prediction of strange eigenmodes. (geosci.uchicago.edu)