1. Q.R. Ahmad et al. (SNO Collaboration), Phys. Rev. Lett. 87, 071301 (2001)
2. Q.R. Ahmad et al. (SNO Collaboration), Phys. Rev. Lett. 89, 011301 (2002)
3. K. Eguchi et al. (KamLAND Collaboration), Phys. Rev. Lett. 90, 021802 (2003)
4. G. Bellini et al. (Borexino Collaboration), Phys. Rev. Lett. 107, 141302 (2011)
5. Borexino Collaboration, Nature 512, 383–386 (2014)