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R.D. Lasley; J.O. Hegge; M.A. Noble; R.M. Mentzer. (1999). Evidence that cytosolic and ecto 5'-nucleotidases contribute equally to increased interstitial adenosine concentration during porcine myocardial ischemia. , 94(3), 199–207. doi:10.1007/s003950050143 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research