R. J. Wiechmann, R. D. Hanna, J. A. Stange, G. H. Johnson, R. I. Fernandes, and J. D. Rozich, “NextStitch: Double-Stranded Suture Chain, a Tool to Optimize Approximation of Sutures in Valve Surgery with Echocardiographic Correlation”, HSF, vol. 6, no. 1, pp. 24-29, Feb. 2005.