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| 2021-05-26 | Reference included | | | Bertkau, 1875 |
| 2021-05-25 | Reference included | | | Yong et al., 2021 |
| 2021-05-25 | Reference included | | | Sankaran, Caleb & Sebastian, 2021d |
| 2021-05-25 | Reference included | | | El-Hennawy & Al-Saraireh, 2021 |
| 2021-05-25 | Reference included | | | Seyyar, 2021 |
| 2021-05-21 | Reference included | | | Tang et al., 2021 |
| 2021-05-21 | Reference included | | | Sankaran, Caleb & Sebastian, 2021c |
| 2021-05-21 | Reference included | | | Liu et al., 2021c |
| 2021-05-18 | Reference included | | | Perger & Dupérré, 2021 |
| 2021-05-17 | Reference included | | | Purgat et al., 2021a |
| 2021-05-16 | Reference included | | | Lin & Li, 2021 |
| 2021-05-14 | Reference included | | | Chen et al., 2021a |
| 2021-05-14 | Reference included | | | Xie, Liu & Peng, 2021 |
| 2021-05-13 | Reference included | | | Rubio, Stolar & Baigorria, 2021 |
| 2021-05-13 | Reference included | | | Coşar & Erdek, 2021 |
| 2021-05-12 | Reference included | | | Yao, Wang & Li, 2021 |
| 2021-05-12 | Reference included | | | Wilson et al., 2021a |
| 2021-05-11 | Reference included | | | Huang et al., 2021b |
| 2021-05-10 | Reference included | | | Perger & Rubio, 2021b |
| 2021-05-09 | Reference included | | | Rozwałka & Czaja, 2021b |
| 2021-05-09 | Reference included | | | Rozwałka & Czaja, 2021a |
| 2021-05-06 | Reference included | | | Rodrigues, Marta & Figueiredo, 2021 |
| 2021-05-05 | Reference included | | | Perger, Rubio & Haddad, 2021 |
| 2021-05-05 | Reference included | | | Lee, Yoo & Kim, 2021a |
| 2021-05-05 | Reference included | | | Fomichev & Marusik, 2021a |
| 2021-05-05 | Reference included | | | Bodkhe et al., 2021 |
| 2021-05-05 | Reference included | | | Abhijith, Sheeba & Sudhikumar, 2021 |
| 2021-05-03 | Reference included | | | Serita, 2021e |
| 2021-05-03 | Reference included | | | Serita, 2021d |
| 2021-05-03 | Reference included | | | Serita, 2021c |
| 2021-05-03 | Reference included | | | Suzuki et al., 2021 |
| 2021-05-03 | Reference included | | | Suzuki & Serita, 2021b |
| 2021-05-03 | Reference included | | | Suzuki & Serita, 2021a |
| 2021-05-03 | Reference included | | | Suzuki, 2021b |
| 2021-05-03 | Reference included | | | Suzuki & Terada, 2021 |
| 2021-05-03 | Reference included | | | Ochi & Shinta, 2021 |
| 2021-05-03 | Reference included | | | Serita, 2021b |
| 2021-05-03 | Reference included | | | Serita, 2021a |
| 2021-05-03 | Reference included | | | Nagai, 2021 |
| 2021-05-03 | Reference included | | | Satoru, 2021 |
| 2021-05-03 | Reference included | | | Kazeta, 2021 |
| 2021-05-03 | Reference included | | | Suzuki, 2021a |
| 2021-05-03 | Reference included | | | Matsuki, Mitamura & Baba, 2021 |
| 2021-05-03 | Reference included | | | Baba & Moriguchi, 2021 |
| 2021-05-03 | Reference included | | | Sakamoto & Baba, 2021 |
| 2021-05-03 | Reference included | | | Tanigawa, 2021 |
| 2021-05-03 | Reference included | | | Suzuki & Matsushima, 2021 |
| 2021-05-03 | Reference included | | | Dolejš, 2020 |
| 2021-05-03 | Reference included | | | Roušar, 2020c |