ISO/IEC 6937, p.6 «Use of the following characters: LATIN CAPITAL LETTER L WITH MIDDLE DOT, LATIN SMALL LETTER L WITH MIDDLE DOT and LATIN SMALL LETTER N PRECEDED BY APOSTROPHE, is deprecated, and they should better be encoded as ‘l’ / ‘L’ followed by MIDDLE DOT, and APOSTROPHE followed by ‘n’, respectively.»ISO/IEC 6937 : Technologies de l'information — Jeu de caractères graphiques codés pour la transmission de texte — Alphabet latin, , 3eéd. (présentation en ligne)
Valiente Feruglio et Fuster 1993, p.258. (en) Gabriel Valiente Feruglio et Robert Fuster, «Typesetting Catalan Texts with TEX», TUGboat, vol.14, no3 «Proceedings of the 1993 Annual Meeting», , p.252–259 (lire en ligne)