Suharyana Suharyana Physics Department, Faculty of Mathematics and Natural Sciences, Sebelas Maret University Surakarta 57126, Indonesia Indonesia
J.M. Cadogan School of Physics, The University of New South Wales, Kensington NSW 2033, Australia Australia
A. Rianaris Physics Department, Faculty of Mathematics and Natural Sciences, Sebelas Maret University Surakarta 57126, Indonesia Indonesia