| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5304262 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5304250 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5304305 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5304320 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5304345 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5304345 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5304402 |
