GENERALIZED ACTION INVARIANTS FOR DRIFT WAVES-ZONAL FLOW SYSTEMS Статья Smolyakov A.I., Diamond P.H. Physics of Plasmas. Том 6. 1999. С. 4410-4413
WHICH ACTION FOR BRANE WORLDS? Статья Dick R. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. Том 491. 2000. С. 333-338