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2. ISO/IEC. 2001. ISO/IEC 9126-1:2001 Software engineering --- Product quality --- Part 1: Quality model. ISO/IEC 9126-1:2001 1 (2001) 1--25. ISO/IEC. 2001. ISO/IEC 9126-1:2001 Software engineering --- Product quality --- Part 1: Quality model. ISO/IEC 9126-1:2001 1 (2001) 1--25.
3. ISO/IEC. 2003. ISO/IEC TR 9126-3:2003 Software engineering --- Product quality --- Part 3: Internal metrics. ISO/IEC 9126-3:2003 2 (2003) 1--62. ISO/IEC. 2003. ISO/IEC TR 9126-3:2003 Software engineering --- Product quality --- Part 3: Internal metrics. ISO/IEC 9126-3:2003 2 (2003) 1--62.
4. ISO/IEC. 2014. ISO/IEC 25000:2014 Systems and software engineering --- Systems and software Quality Requirements and Evaluation (SQuaRE) --- Guide to SQuaRE. ISO/IEC 25000:2014 2 (2014) 1--27. ISO/IEC. 2014. ISO/IEC 25000:2014 Systems and software engineering --- Systems and software Quality Requirements and Evaluation (SQuaRE) --- Guide to SQuaRE. ISO/IEC 25000:2014 2 (2014) 1--27.
5. ISO/IEC. 2016. ISO/IEC 25023:2016 Systems and software engineering---Systems and software Quality Requirements and Evaluation (SQuaRE) --- Measurement of system and software product quality. ISO/IEC 25023:2016 1 (2016) 1--45. ISO/IEC. 2016. ISO/IEC 25023:2016 Systems and software engineering---Systems and software Quality Requirements and Evaluation (SQuaRE) --- Measurement of system and software product quality. ISO/IEC 25023:2016 1 (2016) 1--45.