The different SLS 3D printers on the market - 3Dnatives
Low Cost Selective Laser Sintering: The Innovator's Dilemma in Powder? - 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing
OpenSLS - An Open Source Project Creates a Sub-$15K Selective Laser Sintering 3D Printer - 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing