http://www.21cm.com/pdfs/hippo_published.pdf
http://imsear.li.mahidol.ac.th/bitstream/123456789/134785/1/jiafm2007v29i3p10.pdf
http://cryoeuro.eu:8080/download/attachments/1441801/Darwin_Michael_+G_+Biography_v4.3.pdf
http://www.advancedneuralbio.com/pubs/Advanced%20Neural%20Biosciences.pdf
http://www.advancedneuralbio.com/pubs/Human%20Cryopreservation%20Research%20at%20Advanced%20Neural%20Biosciences.pdf
http://www.ijcep.com/files/IJCEP707005.pdf
http://www.sciencedirect.com/science/article/pii/S001122401500245X
http://aurellem.org/ASC/html/ASC-FAQ.html
http://stm.sciencemag.org/content/9/379/eaah4586