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Kumara, A. M. I. U. ,  Drechsel, Pay ,  Fernando, Sudarshana ,  Jayathilake, Nilanthi ,  [Perceptions towards new restrictions on polythene usage in Sri Lanka: case study in Colombo city. [Abstract only]] ,  Perceptions towards new restrictions on polythene usage in Sri Lanka: case study in Colombo city. [Abstract only]