It took years to prepare the article found here around the CellCore concept used in the CellTank product.
Veronique Chotteau and Ye Zhang both from Royal Institute of Technology, Stockholm, Sweden, www.biotech.kth.se. CellTank (model 34) bioreactor with suspension CHO cells performed December 2011 and January 2015 presented in Journal of Biotechnology 2015, 213: 38-41.
Download article from Journal of Biotechnology, “Very high cell density perfusion of CHO cells anchored in a non-woven matrix-based bioreactor”. Identified 2015 as a Key Scientific Article contributing to excellence in biomedical research by www.globalmedicaldiscovery.com