求Elsevier英文文献两篇

1.【作者(必填)】Emilio Rodríguez-Caballeroa, , , Yolanda Cantóna, Sonia Chamizob, Ashraf Afanab, Albert Solé-Benetb【文题(必填)】Effects of biological soil crusts on surface roughness and implications for runoff and erosion

【年份(必填)】
Volumes 145–146, 1 April 2012, Pages 81–89  Geomorphology

【全文链接或数据库名称(选填)】http://www.sciencedirect.com/science/article/pii/S0169555X1100657X  
2.【作者(必填)】Kerstin Verzanoa, , ,
Ilona Bärlunda, Martina Flörkea, Bernhard Lehnerb, Ellen Kynasta, Frank Voßa, Joseph Alcamoa, c  【文题(必填)】Modeling variable river flow velocity on continental scale: Current situation and climate change impacts in Europe
  【年份(必填)】2012
Journal of Hydrology
Volumes 424–425, 6 March 2012, Pages 238–251
【全文链接或数据库名称(选填)】http://www.sciencedirect.com/science/article/pii/S0022169412000248

ur needs