Fahru Nurosyid Physics Department, Faculty of Mathematics and Natural Science - Sebelas Maret University
Jl. Ir Sutami 36 A Kentingan, Surakarta 57126 Indonesia
Budi Purnama Physics Department, Faculty of Mathematics and Natural Science - Sebelas Maret University
Jl. Ir Sutami 36 A Kentingan, Surakarta 57126 Indonesia