Fajar Adi-Kusumo Departemen Matematika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Gadjah Mada, Sekip Utara Yogyakarta 55281, INDONESIA Indonesia
Nanang Susyanto * Corresponding Author Departemen Matematika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Gadjah Mada, Sekip Utara Yogyakarta 55281, INDONESIA Indonesia
Irwan Endrayanto Departemen Matematika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Gadjah Mada, Sekip Utara Yogyakarta 55281, INDONESIA
Andreasta Meliala Pusat Kebijakan dan Manajemen Kesehatan, Fakultas Kedokteran, Kesehatan Masyarakat, dan Keperawatan, Universitas Gadjah Mada, Sekip Utara Yogyakarta 55281, INDONESIA
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