@article{SM_1993_76_2_a12,
     author = {A. Yu. Kolesov and Yu. S. Kolesov},
     title = {Relaxation cycles in systems with delay},
     journal = {Sbornik. Mathematics},
     pages = {507--522},
     publisher = {mathdoc},
     volume = {76},
     number = {2},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1993_76_2_a12/}
}