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Liu, Huixia; Jiang, Hairong; Guo, Dehui; Chen, Guochun; Yan, Zhang; Li, Pin; Zhu, Hejun; Chen, Jun; Wang, Xiao . (2015). Study on Welding Mechanism Based on Modification of Polypropylene for Improving the Laser Transmission Weldability to PA66. Materials, 8(8), 4961–4977. doi:10.3390/ma8084961 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research