8Weise W, Wolfgang W, Voelcker A, et al. Cadmium-free silver alloy brazing solder, method of using said solder, and metal articles brazed with said solder, United States, US 5531962 [ P]. 1996 - 07 - 02.
9Shi Y W, Tian J, Hao H, et al. Effects of small amount of rare earth Er on microstructnre and property of SnAgCu solder [ J ]. Journal of Alloys and Compounds, 2008, 453 ( 1 - 2) : 180 - 184.
10Zhang L, Xue S B, Gao L L, et al. Effects of rare earths on properties and microstructures of lead-free solder alloys[ J]. Journal of Materials Science : Materials in Electronics, 2009, 20 ( 8 ) : 685 - 694.