By Erdog˘an M.   in Geometriae Dedicata

ISSN:0046-5755|61|3|221-225

Springer Publishing Company ‎(1996)‎

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By Comakli O.   Celik C.   Erdog   an S.   in Energy Conversion and Management

ISSN:0196-8904|40|2|193-203

Elsevier‎(1999)‎

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