Wrench, P. M.; Irwin, B. V. W. (1 August 2015). "Towards a PHP webshell taxonomy using deobfuscation-assisted similarity analysis". 2015 Information Security for South Africa (ISSA). pp.1–8. doi:10.1109/ISSA.2015.7335066. ISBN978-1-4799-7755-0. S2CID10056400– via IEEE Xplore.
Wrench, P. M.; Irwin, B. V. W. (1 August 2015). "Towards a PHP webshell taxonomy using deobfuscation-assisted similarity analysis". 2015 Information Security for South Africa (ISSA). pp.1–8. doi:10.1109/ISSA.2015.7335066. ISBN978-1-4799-7755-0. S2CID10056400– via IEEE Xplore.