@article{ZNSL_1971_23_a13,
     author = {M. N. Yakovlev},
     title = {On estimate of the error of the solution of {Cauchy} problem for system of ordinary differential equations of second order},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {138--139},
     publisher = {mathdoc},
     volume = {23},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_23_a13/}
}