Bao Rong Chang, Hsiu-Fen Tsai, Chia-Yen Chen, Chien-Feng Huang, and Hung-Ta Hsu, “Implementation of Secondary Index on Cloud Computing NoSQL Database in Big Data Environment,” Scientific Programming, Vol. 2015, Article ID 560714, 10 pages, August 2015. (SCI, EI) (IF=0.559, JCR 2014) (MOST 103-2221-E-390-011)