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Alwadood, Zuraida and Ayub, Hamidah and Razali, Muhamad Ariff Izzuddin (2010) A modified integer programming model for cleaning service scheduling / Zuraida Alwadood, Hamidah Ayub and Muhamad Ariff Izzuddin Razali. Scientific Research Journal, 7 (1). pp. 37-49. ISSN 1675-7009