@misc {MATHEDUC.02453365,
    author       = {Gerente, M.},
    title        = {Law of operations. Loi de composition.},
    howpublished = {Grand N. (Feb 1976) v. 8 p. 13-35. [ISSN 0152-4682]},
    year         = {1976},
    identifier   = {1977d.01699},
}