@article{ZR_1984_4_12_a23,
     author = {Ljubodrag Radosavljevi\'c},
     title = {On {Determination} of {Principal} {Frequencies} of {Elastic} {Systems} with {Many} degrees of {Freedom} by a {Method} of {Successive} {Approximations}},
     journal = {Zbornik radova},
     pages = {181 },
     publisher = {mathdoc},
     volume = {4},
     number = {12},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZR_1984_4_12_a23/}
}