S. Abiteboul, R. Hull, and V. Vianu, Foundations of Databases, 1995.

N. Bidoit, M. Herschel, and K. Tzompanaki, Query-based whynot provenance with Nedexplain, International Conference on Extending Database Technology (EDBT), 2014.
URL : https://hal.archives-ouvertes.fr/hal-00962157

A. Chapman and H. V. Jagadish, Why not?, Proceedings of the 35th SIGMOD international conference on Management of data, SIGMOD '09, 2009.
DOI : 10.1145/1559845.1559901

T. J. Green, G. Karvounarakis, and V. Tannen, Provenance semirings, Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems , PODS '07, 2007.
DOI : 10.1145/1265530.1265535

Z. He and E. Lo, Answering Why-not Questions on Top-k Queries, 2012 IEEE 28th International Conference on Data Engineering, 2012.
DOI : 10.1109/ICDE.2012.8

M. Herschel, Wondering why data are missing from query results? ask conseil why-not, International Conference on Information and Knowledge Management (CIKM), 2013.
DOI : 10.1145/2505515.2505725

URL : https://hal.archives-ouvertes.fr/hal-00909210

M. Herschel and M. A. Hernández, Explaining missing answers to SPJUA queries, Proceedings of the VLDB Endowment (PVLDB), 2010.
DOI : 10.14778/1920841.1920869

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

J. Huang, T. Chen, A. Doan, and J. F. Naughton, On the provenance of non-answers to queries over extracted data, Proceedings of the VLDB Endowment (PVLDB), 2008.
DOI : 10.14778/1453856.1453936

T. Imieli´nskiimieli´nski and J. W. Lipski, Incomplete information in relational databases, Journal of the ACM, vol.31, issue.4, 1984.

. Md, R. Islam, C. Zhou, and . Liu, On answering why-not questions in reverse skyline queries, International Conference on Data Engineering (ICDE), 2013.