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Datus Salamia I, Laksmi Rithmaya C. Business Communication Strategy of PT Telekomunikasi Selular Surabaya Branch in Sponshorship Negotiation Process . IJSE [Internet]. 2025 Aug. 8 [cited 2025 Aug. 19];5(3):420-3. Available from: https://ijsenet.com/index.php/IJSE/article/view/199