1. Kh. U. Abraamyan et al., Phys. Rev. C 80, 034001 (2009), Kh. U. Abraamyan et al., Dokl. Phys. 55, 161 (2010), Kh. U. Abraamyan et al., Phys. Part. Nucl. 41, 1097 (2010), Kh. U. Abraamyan et al., Phys. At. Nucl. 75, 657 (2012).
2. E. van Beveren and G. Rupp, “First indications of the existence of a 38 MeV light scalar boson,” arXiv: 1102.1863v2.
3. Kh. U. Abraamyan et al., “Check of the structure in photon pairs spectra at the invariant mass of about 38 MeV/c
2,” EPJ Web Conf. 204, 08004 (2019).
4. A. J. Krasznahorkay et al., “Observation of anomalous internal pair creation in 8Be: A possible indication of a light, neutral boson,” Phys. Rev. Lett. 116, 042501 (2016), arXiv:1504.01527 [nucl-ex], A. J. Krasznahorkay et al., “New evidence supporting the existence of the hypothetic X17 particle,” arXiv:1910.10459v1 [nucl-ex], A. J. Krasznahorkay et al., “A new anomaly observed in 4He supports the existence of the hypothetical X17 particle,” (2021). arXiv:2104.10075v1 [nucl-ex].
5. Proceedings of the “Shedding Light on X17” Workshop, Rome, 2021. https://agenda.infn.it/event/26303/.