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On the 16th Hilbert problem for limit cycles on nonsingular algebraic curves
Journal of Differential Equations, 2011Jaume Llibre
exaly
The 16th Hilbert problem on algebraic limit cycles
Journal of Differential Equations, 2011Xiang Zhang
exaly
EPA RE-ESTABLISHES LOWER ARSENIC LIMIT FOR DRINKING WATER; NEW STANDARD FULLY IN EFFECT BY 2006
Ca-A Cancer Journal for Clinicians, 2002exaly