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Naibaho, Joshua Perkasa and Tambunan, Martua E. and Mangani, Ktut Silvanita (2022) Analysis of Abnormal Return before and after the Announcement of Covid – 19 in Companies Engaged in the Hotel Sector. Budapest International Research and Critics Institute-Journal (BIRCI-Journal), 5 (2). pp. 10040-10051. ISSN 2615-3076