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Ojeda-Barrios, D.L; Sánchez-Chávez, E; Sida-Arreola, J.P; Valdez-Cepeda, R; Balandran-Valladares, M . (2016). The impact of foliar nickel fertilization on urease activity in pecan trees. Journal of soil science and plant nutrition, (ahead), 0–0. doi:10.4067/S0718-95162016005000019 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research