May 2021

  1. 10.21541/apjes.732592
  2. 10.21541/apjes.735378
  3. 10.21541/apjes.742541
  4. 10.21541/apjes.750212
  5. 10.21541/apjes.774425
  6. 10.21541/apjes.778563
  7. 10.21541/apjes.782896
  8. 10.21541/apjes.783976
  9. 10.21541/apjes.805998
  10. 10.21541/apjes.816398
  11. 10.21541/apjes.818717
  12. 10.21541/apjes.821861
  13. 10.21541/apjes.827905
  14. 10.21541/apjes.844262
  15. 10.21541/apjes.855080
  16. 10.21541/apjes.729035
  17. 10.21541/apjes.859623
  18. 10.21541/apjes.923838
  19. 10.21541/apjes.718960
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