@article{SM_2024_215_2_a2,
     author = {V. A. Kamenetskiy},
     title = {The circle criterion and {Tsypkin's} criterion for systems with~several nonlinearities without the use of the $S$-procedure},
     journal = {Sbornik. Mathematics},
     pages = {169--182},
     publisher = {mathdoc},
     volume = {215},
     number = {2},
     year = {2024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2024_215_2_a2/}
}