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Ullah, Hafeez; M Azizli, Khairun Azizi; Man, Zakaria B; Ismail, Mukhtar B Che; Khan, Muhammad Irfan . (2016). The Potential of Microencapsulated Self-healing Materials for Microcracks Recovery in Self-healing Composite Systems: A Review. Polymer Reviews, (), 1–57. doi:10.1080/15583724.2015.1107098 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research