[1] Wiggins, A. (2009), SQL Databases Don't Scale.
http://adam.heroku.com/past/2009/7/6/sql_databases_d
ont_scale/
[2] Abadi, D. J. (2009), Data Management in the Cloud:
Limitations and Opportunities. IEEE Data Engineering
Bulletin, Volume 32, Number 1, March 2009, pp. 3-12
[3] Garret (2010), What is a Column Oriented Database?
http://www.columnorienteddatabase.com/
[4] DeCandia, G., D. Hastorun, M. Jampani, G.
Kakulapati, A. Lakshman, A. Pilchin, S.
Sivasubramanian, P. Vosshall, and W. Vogels(2007)
Dynamo: Amazon’s highly available key-value store, In
SOSP, pp. 205–220
[5] Dean, J. and S. Ghemawat (2004) Mapreduce:
Simplified data processing on large clusters.
Proceedings of the 6th conference on Symposium on
Opearting Systems Design & Implementation ACM pp.
137–150
[6] C. Gentry, Computing arbitrary functions of
encrypted data, Commun. ACM, Vol. 53, No. 3., pp. 97-
105, March 2010.
[7] C. Gentry, A fully homomorphic encryption
scheme. PhD thesis, Stanford University, 2009.
[8] M. Raykova, B. Vo, and S. Bellovin, Secure
Anonymous Database Search, CCSW’09, pp. 115-126,
Chicago, Illinois, USA, November 13, 2009. 
[9] N. Shang, G. Ghinita, Y. Zhou, and E. Bertino,
Controlling Data Disclosure in Computational PIR
Protocols. ASIACCS’10, pp. 310- 313, Beijing, China,
April 13–16, 2010.
[10] T. Nakamura, S. Inenaga, D. Ikeda, K. Baba, H.
Yasuura, Anonymous Authentication Systems Based
on Private Information Retrieval. Networked Digital
Technologies. NDT '09, pp.53-58, 28- 31 July 2009.
[11] S. Yinan and Z. Cao, Extended Attribute Based
Encryption for Private Information Retrieval. Mobile
Adhoc and Sensor Systems, 2009. MASS '09, pp. 702-
707, 12-15 Oct. 2009.
[12] C. Gentry and Z. Ramzan, Single-Database Private
Information Retrieval with Constant Communication
Rate. ICALP 2005, LNCS 3580, pp. 803–815, 2005.
[13] C. A. Melchor and P. Gaborit, A Fast Private
Information Retrieval Protocol. ISIT 2008, pp. 1848-
1852, Toronto, Canada, July 6 - 11, 2008.