vol. 31, no. 1 (2011)

On strongly midconvex functions
Antonio Azócar, José Giménez, Kazimierz Nikodem, José Luis Sánchez
Opuscula Math. 31, no. 1 (2011), 15-26, http://dx.doi.org/10.7494/OpMath.2011.31.1.15
On operators of transition in Krein spaces
A. Grod, S. Kuzhel, V. Sudilovskaya
Opuscula Math. 31, no. 1 (2011), 49-59, http://dx.doi.org/10.7494/OpMath.2011.31.1.49