@article{MZM_1993_54_1_a3,
     author = {S. \'E. Lapin},
     title = {Recurrence of trajectories of systems of linear differential equations with conditionally periodic coefficients},
     journal = {Matemati\v{c}eskie zametki},
     pages = {52--56},
     publisher = {mathdoc},
     volume = {54},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_1_a3/}
}