Sources:
Green Book, 2^nd ed., p. 93 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)
PAC, 1988, 60, 1115. 'Names for hydrogen atoms, ions, and groups, and for reactions involving them (Recommendations 1988)' on page 1116 (https://doi.org/10.1351/pac198860071115)