@article {410, title = {A method for Hamiltonian truncation: a four-wave example}, journal = {Journal of Physics A: Mathematical and Theoretical}, volume = {49}, year = {2016}, month = {Oct-04-2017}, pages = {165501}, issn = {1751-8113}, doi = {10.1088/1751-8113/49/16/165501}, author = {Thiago F. Viscondi and I. L. Caldas and P.J. Morrison} }