DIAN NOER INDAH SARI,
Indonesia 
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The Department of Mathematics, The first floor of C-8 Building,
Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya
Jl. Ketintang, Surabaya 60231, East Java, Indonesia
Homepage: https://ejournal.unesa.ac.id/index.php/mathunesa/Home
E-mail: mathunesa@unesa.ac.id
