* {{cite journal | last1 = Ahmed | first1 = E. | year = 2006 | title = On modeling the immune system as a complex system | url = | journal = Theor. BioSci. | volume = 124 | issue = 3–4| pages = 413–8 | bibcode = 2008arXiv0801.0847A | arxiv = 0801.0847 | doi = 10.1016/j.thbio.2005.07.001 | pmid = 17046369 }} | * {{cite journal | last1 = Ahmed | first1 = E. | year = 2006 | title = On modeling the immune system as a complex system | url = | journal = Theor. BioSci. | volume = 124 | issue = 3–4| pages = 413–8 | bibcode = 2008arXiv0801.0847A | arxiv = 0801.0847 | doi = 10.1016/j.thbio.2005.07.001 | pmid = 17046369 }} |