f_{core}
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Recent Referers:
  1. http://formula.s21g.com/?f_%7Bcore%7D
  2. https://formula.s21g.com/formulae/48235
  3. https://formula.s21g.com/?f_%7Bcore%7D
  4. http://formula.s21g.com/?f_%7Bcore%7D.png
  5. http://tmt.nao.ac.jp/ETC_readme.html