[1] [CITE[PPTA Wiki | Main / PPTA]], [TIME[2023-04-25T07:40:34.000Z]] <https://www.atnf.csiro.au/research/pulsar/ppta/>

- [2] [CITE@en[Development of a pulsar-based time-scale | Monthly Notices of the Royal Astronomical Society | Oxford Academic]], [TIME[2023-04-25T07:40:43.000Z]] <https://academic.oup.com/mnras/article/427/4/2780/971096>


[6] [CITE[3. Hisamoto - Applications-for-Seminar.pdf]], [TIME[2015-08-14T08:24:08.000Z]], [TIME[2023-04-25T07:54:20.059Z]] <https://www.mpe.mpg.de/events/593-heraeus-seminar/Talks-and-Posters/4-Thursday/PDF/3.%20Hisamoto%20-%20Applications-for-Seminar.pdf>

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[5] [CITE[Space/ground based pulsar timescale for comprehensive PNT system]], [TIME[2023-04-25T07:50:27.000Z]] <https://wulixb.iphy.ac.cn/en/article/doi/10.7498/aps.70.20210288>

[4] [CITE@en[Chinese scientists propose ‘religion-free’ calendar for the space age | South China Morning Post]], [TIME[2023-04-25T07:46:37.000Z]] <https://www.scmp.com/news/china/science/article/3185053/chinese-scientists-propose-religion-free-calendar-space-age>

[3] [CITE@en[China Proposes New Calendar For Measuring Space Better]], [TIME[2023-04-25T07:43:48.000Z]] <https://www.newsweek.com/new-universal-calendar-future-space-travel-ad-china-1724253>