la question posée
Problèmes plaisans et délectables
@article{RO_1978__12_4_400_0, author = {Bessi\`ere, F.}, title = {Probl\`emes plaisans et d\'electables}, journal = {RAIRO - Operations Research - Recherche Op\'erationnelle}, pages = {400--400}, publisher = {EDP-Sciences}, volume = {12}, number = {4}, year = {1978}, language = {fr}, url = {http://archive.numdam.org/item/RO_1978__12_4_400_0/} }
Bessière, F. Problèmes plaisans et délectables. RAIRO - Operations Research - Recherche Opérationnelle, Tome 12 (1978) no. 4, p. 400. http://archive.numdam.org/item/RO_1978__12_4_400_0/