?:authorAffiliation
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[\'Department of Mathematics, Soongsil University, 369 Sangdoro, Dongjak-Gu, Seoul 06978, Republic of Korea.\', \'Department of Mathematics, Soongsil University, 369 Sangdoro, Dongjak-Gu, Seoul 06978, Republic of Korea. Electronic address: alicia@ssu.ac.kr.\']
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