1. [1] G. Spandan, A. Patel, C.R. Manjunath, and G.S. Nagaraj, “Data aggregation protocols in wireless sensor networks,” Int. J. Comput. Eng. Res., vol.3, no.5, pp.18-24, May 2013.
2. [2] A. Sardouk, L. Merghem-Boulahia, R. Rahim-Amoud, and D, Gaiti, “Data aggregation in WSNs: A survey,” Materials Science Research Journal, vol.4, no.4, pp.327-370, ISSN: 1935-2441. https://www.novapublishers.com/catalog/product_info.php?products_id=25000
3. [3] Japan Ministry of Economy, Smart Meter Institution Investigative Commission Report, Feb. 2011. http://www.meti.go.jp/committee/summary/0004668/report_001_01_00.pdf
4. [4] S. Sharad, S. Mishra, A.K. Sharma, and D.S. Chauhan, “Analysis on energy optimized data collection in tree based ad-hoc sensor network,” International Journal of Modern Education and Computer Science, vol.4, no.3, pp.42-49, March 2012.
5. [5] W.-Z. Song, F. Yuan, and R. LaHusen, “Time-optimum packet scheduling for many-to-one routing in wireless sensor networks,” Proc. 2006 IEEE International Conference on Mobile Ad Hoc and Sensor Sysetems, pp.81-90, 2006.