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Sterling D. Miller, Earl F. Becker and Warren B. Ballard. (1987). A Selection of Papers from the Seventh International Conference on Bear Research and Management, Williamsburg, Virginia, USA, and Plitvice Lakes, Yugoslavia, February and March 1986 || Black and Brown Bear Density Estimates Using Modified Capture-Recapture Techniques in Alaska. Bears: Their Biology and Management, 7(), 23–35. doi:10.2307/3872604 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research