@Article{npg-21-49-2014,
AUTHOR = {Balk, A. M.},
TITLE = {The Rossby wave extra invariant in the dynamics of 3-D fluid layers and  the generation of zonal jets},
JOURNAL = {Nonlinear Processes in Geophysics},
VOLUME = {21},
YEAR = {2014},
NUMBER = {1},
PAGES = {49--59},
URL = {https://npg.copernicus.org/articles/21/49/2014/},
DOI = {10.5194/npg-21-49-2014}
}