@article{MAN_1991__291_1_164893,
     author = {Hubert Flenner and Leendert J. van Gastel},
     title = {Joins and intersections.},
     journal = {Mathematische Annalen},
     pages = {691--704},
     publisher = {mathdoc},
     volume = {291},
     number = {1},
     year = {1991},
     zbl = {0761.14018},
     url = {http://geodesic.mathdoc.fr/item/MAN_1991__291_1_164893/}
}