ANALELE STIINTIFICE ALE UNIVERSITATII AL I CUZA DIN IASI-SERIE NOUA-MATEMATICA, vol.54, no.1, pp.75-85, 2008 (SCI-Expanded)
In 1996, DONTCHEV [4] introduced and investigated the notion of contra-continuity. In this paper we introduce and study the basic properties of upper (lower) contra-continuous multifunctions.