@article{SJVM_2002_5_1_a5,
     author = {J. H. He},
     title = {Approximate analytical solution for certain strongly nonlinear oscillations by the variational iteration method},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {57--69},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2002_5_1_a5/}
}