Zeng, Ning
Zhao, Fang
Collatz, George J.
Kalnay, Eugenia
Salawitch, Ross J.
West, Tristram O.
Guanter, Luis
Article History
Received: 6 July 2013
Accepted: 24 September 2014
First Online: 19 November 2014
Competing interests
: The authors declare no competing financial interests.