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A.L. Mercado; C.E. Allmond; J.G. Hoekstra; J.M. Fitz-Gerald. (2005). Pulsed laser deposition vs. matrix assisted pulsed laser evaporation for growth of biodegradable polymer thin films. , 81(3), 591–599. doi:10.1007/s00339-004-2994-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research