| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5320058 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5320103 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5320111 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5320122 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5320131 |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5320262 |
