PŮST, L., SZÖLLÖS, O. Interaction of two strong nonlinearities. In: TRUE, H., SORENSEN, M. P., eds. EUROMECH : Nonlinear oscillations conference. Lyngby: TU of Denmark, 2000, s. 1-9. Dostupné z: http://www.imm.dtu.dk/documents/users/mps/ENOC/proceedings/