@article{TAM_1985_11_1_a6,
     author = {Katica  and Stevanovi\'c and  Hedrih and Predrag Kozi\'c and Ratko Pavlovi},
     title = {A stationary and nonstationary $R$-frequency analysis of vibrations of the systems with a finite number of degrees of freedom of vibrations and mutual influences of the harmonics},
     journal = {Theoretical and applied mechanics},
     pages = {73 },
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1985_11_1_a6/}
}