@article{TMF_2003_137_3_a1,
     author = {I. Bakirtas and H. Demiray},
     title = {Amplitude {Modulation} of {Nonlinear} {Waves} in {Fluid-Filled} {Tapered} {Tubes}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {325--335},
     year = {2003},
     volume = {137},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2003_137_3_a1/}
}