Funding for this research was provided by:
National Natural Science Foundation of China (61272304, 61363029)
the Guangxi Key Laboratory of Trusted Software (kx201313)
ORCID
San-yuan ZHANG: http://orcid.org/0000-0001-8604-874X
Publication History
Received: 2016-01-25
Accepted: 2016-05-12
Crosschecked: 2017-11-20
Content Type
: Article
Copyright
: © Zhejiang University and Springer-Verlag GmbH Germany 2017