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bc.edu
www2.bc.edu
Strother, Paul K. (22 January 2010). "What is life?". Origin and Evolution of Life on Earth. Boston College. Archived from the original on 20 December 2016. பார்க்கப்பட்ட நாள் 12 November 2016.
Trifonov, Edward N. (17 March 2011). "Vocabulary of Definitions of Life Suggests a Definition". Journal of Biomolecuoar Structure and Dynamics29 (2): 259–266. doi:10.1080/073911011010524992. பப்மெட்:21875147.
Trifonov, Edward N. (17 March 2011). "Vocabulary of Definitions of Life Suggests a Definition". Journal of Biomolecuoar Structure and Dynamics29 (2): 259–266. doi:10.1080/073911011010524992. பப்மெட்:21875147.
Mullen, Leslie (19 June 2002). "Defining Life". Astrobiology Magazine. NASA. Archived from the original on 21 April 2012. பார்க்கப்பட்ட நாள் 12 November 2016.
Strother, Paul K. (22 January 2010). "What is life?". Origin and Evolution of Life on Earth. Boston College. Archived from the original on 20 December 2016. பார்க்கப்பட்ட நாள் 12 November 2016.