87. The following are required to be represented before the courts by a lawyer in contentious proceedings, and by a lawyer or a notary in non-contentious proceedings:1° representatives, mandataries, tutors and curators and other persons acting on behalf of another person who, for serious reasons, cannot act on their own behalf;
2° in a class action, the representative plaintiff or any person applying to act in that capacity;
3° legal persons;
4° general or limited partnerships and associations and other groups not endowed with juridical personality, unless all the partners or members act themselves or mandate one of their number to act;
5° the Public Curator, guardians and sequestrators;
6° liquidators, trustees and other representatives of collective interests when acting in that capacity;
7° acquirers of accounts by onerous title, and collection agents.