T. Haque, H. Chen, W. Ouyang, T. Metz, B. Lawuyi, and S. Prakash, “Effect of Integrating Polyethylene Glycol to Alginate-Poly-L-Lysine and Alginate Chitosan Microcapsules for Oral Delivery of Live Cells and Cell Transplant for Therapy”, CMBES Proc., vol. 28, no. 1, Dec. 2005.