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Eulalia Planas; Raquel Poveda; Silvia Sánchez; Asunción Romero; Margarita M. Puig. (2003). Non-steroidal anti-inflammatory drugs antagonise the constipating effects of tramadol. , 482(1-3), 223–226. doi:10.1016/j.ejphar.2003.09.048 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research