Tham khảo Lực thứ năm

  1. Chown, Marcus (ngày 17 tháng 8 năm 2011). “Really dark matter: Is the universe made of holes?”. New Scientist. Pretty much everyone thinks that this so-called dark matter is made of hitherto undiscovered subatomic particles.
  2. Wetterich, C. “Quintessence – a fifth force from variation of the fundamental scale” (PDF). Heidelberg University.
  3. “[no title cited]” (PDF). CERN.
  4. Cicoli, Michele; Pedro, Francisco G.; Tasinato, Gianmassimo (2012). “Natural quintessence in string theory”. Journal of Cosmology and Astroparticle Physics. 2012 (7): 044. arXiv:1203.6655. doi:10.1088/1475-7516/2012/07/044.