@article{MM2_1970__2_153991,
     author = {Bodo Pareigis and Moss E. Sweedler},
     title = {On generators and cogenerators.},
     journal = {Manuscripta mathematica},
     pages = {49--66},
     publisher = {mathdoc},
     volume = {2},
     year = {1970},
     zbl = {0188.05101},
     url = {http://geodesic.mathdoc.fr/item/MM2_1970__2_153991/}
}