(1) http://rsif.royalsocietypublishing.org/content/10/84/2013030...
(2) https://www.sciencedirect.com/science/article/pii/S037907381...
(1) http://rsif.royalsocietypublishing.org/content/10/84/2013030...
(2) https://www.sciencedirect.com/science/article/pii/S037907381...