Oliveira A. L., Sun L., Kim H. J., Rice W., Kluge J., Reis R. L., and Kaplan D. L.,  "Aligned silk-based 3-D architectures for contact guidance in tissue engineering",  Acta Biomaterialia, vol. 8, issue 4, pp. 1530-1542, doi:10.1016/j.actbio.2011.12.015, 2012.