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F. Kurniati
Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jl. Ganesa 10, Bandung, West Java 40132, Indonesia
F. P. Krisna
Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jl. Ganesa 10, Bandung, West Java 40132, Indonesia
J. Junios
Institut Kesehatan Prima Nusantara Bukittinggi
Indonesia
Ph.D Student on Institut Teknologi Bandung, Indonesia
F. Haryanto
Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jl. Ganesa 10, Bandung, West Java 40132, Indonesia