A. Soibel, M. Wright, W. Farr, S. Keo, C. Hill, R. Q. Yang, H. C. Liu, “Mid-infrared Interband Cascade lasers for free-space laser communication”, Free-Space Laser Communication Technologies XXI, Photonics West, San Jose, CA, January 26-29, 2009, CA, USA (in Proc. SPIE 7199, paper 71990E).