1. https://www.sciencedirect.com/science/article/pii/S175558171100068X 2. https://www.sciencedirect.com/science/article/pii/S1755581711000460 3. https://www.sciencedirect.com/science/article/pii/S1755581711000472 4. https://www.sciencedirect.com/science/article/pii/S0747563216304265 5. https://www.sciencedirect.com/science/article/pii/S016636151400181X 6. https://www.sciencedirect.com/science/article/pii/S1568494612003353 7. https://www.sciencedirect.com/science/article/pii/S0925527312002216 8. https://www.sciencedirect.com/science/article/pii/S0166361515300063 9. https://www.sciencedirect.com/science/article/pii/S0166361510000904 10. https://www.sciencedirect.com/science/article/pii/S0925527309000735