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    UPPER AND LOWER NA-CONTINUOUS MULTIFUNCTIONS
    (HACETTEPE UNIV, FAC SCI, 2011) Yuksel, Saziye; Simsekler, Tugba Han; Kut, B.
    The aim of this paper is to introduce a new class of continuous multifunctions, namely upper and lower na-continuous multifunctions, and to obtain some characterizations concerning upper and lower na-continuous multifunctions. The authors investigate the graph of upper and lower na-continuous multifunctions, and the preservation of properties under upper na-continuous multifunctions. Also, the relationship between upper and lower na-continuous multifunctions and some known types of continuous multifunctions are discussed.
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    Upper and lower pre-strong na continuous multifunctions
    (ELSEVIER SCIENCE INC, 2011) Yuksel, Saziye; Simsekler, Tugba Han; Bilik, Berrak
    The aim of this paper is to introduce a new class of multifunctions namely pre-strong na continuous multifunctions and to obtain some characterizations and properties of it. (C) 2011 Elsevier Inc. All rights reserved.