1. E. T. Baskoro:
Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institute Teknologi Bandung, Jalan Ganesa 10 Bandung 40132 Indonesia
2. Y. Nuraeni:
Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institute Teknologi Bandung, Jalan Ganesa 10 Bandung 40132 Indonesia
3. A. A. G. Ngurah:
Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institute Teknologi Bandung, Jalan Ganesa 10 Bandung 40132 Indonesia
4. E. T. Baskoro:
School of Mathematical Sciences, GC University, 68-B, New Muslim Town, Lahore, Pakistan