1. T P Kaloni, M Tahir and U Schwingenschlögl Sci. Rep. 3 3192 (2013)
2. C H Wu arXiv preprint
arXiv:1805.10656
(2018)
3. C H Wu arXiv preprint
arXiv:1711.00547
(2017)
4. C H Wu arXiv preprint
arXiv:1806.03592
(2018)
5. C H Wu arXiv preprint
arXiv:1806.10289
(2018)