- https://www.sciencedirect.com/science/article/pii/S1877050914001045
- https://ac.els-cdn.com/S1877050914001045/1-s2.0-S1877050914001045-main.pdf?_tid=a84352f1-815a-486e-b110-974016ac588b&acdnat=1546490940_2a23e5afff645eb289e6c90afa98290f
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