@article{SJIM_2015_18_1_a4,
     author = {A. N. Koryukin and A. A. Voevoda},
     title = {PID controllers of a~two-mass system and complex pairs of multiplicity~2},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {56--68},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2015_18_1_a4/}
}