“Evaluation of hydrogels for bio-printing applications”. Journal of Biomedical Materials Research Part A101A (1): 272–84. (2013). doi:10.1002/jbm.a.34326. PMID22941807.
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US patent 7051654, Boland, Thomas; Wilson, Jr., William Crisp; Xu, Tao, "Ink-jet printing of viable cells", issued 2006-05-30
“Evaluation of hydrogels for bio-printing applications”. Journal of Biomedical Materials Research Part A101A (1): 272–84. (2013). doi:10.1002/jbm.a.34326. PMID22941807.