Wojciech Kryszewski, Robert Skiba (2012)

Open Mathematics

Asarin, E.A., Bakhtin, I.A., Bobylev, N.A., Bondarenko, V.A., Burd, V.Sh., Chernorutskij, V.V., Gorin, E.A., Kozyakin, V.S., Krasnosel'skij, A.M., Kurzhanskij, A.B., Kuznetsov, N.A., Levin, A.Yu., Mukhamadiev, E.M., Perov, A.I., Pokorny, Yu.V., Pokrovskij, A.V., Rachinskij, D.I., Sadovsky, B.I., Strygin, V.V., Tsypkin, Ya.Z., Yemel'yanov, S.V., Zabreiko, P.P. (1997)

Journal of Applied Mathematics and Stochastic Analysis

Ştefănescu, Mirela, Flaut, Cristina (2004)

Analele Ştiinţifice ale Universităţii “Ovidius" Constanţa. Seria: Matematică

Jean Mawhin, Jindřich Nečas, Břetislav Novák (1980)

Czechoslovak Mathematical Journal

Václav Koutník (1992)

Czechoslovak Mathematical Journal

(1990)

Aplikace matematiky