NGHIEP, T. D. Study on Positron Annihilation Rate in Water. Communications in Physics, [S. l.], v. 14, n. 2, p. 126–128, 2008. DOI: 10.15625/0868-3166/14/2/10705. Disponível em: https://vjs.ac.vn/index.php/cip/article/view/10705. Acesso em: 19 oct. 2021.