@article{CM_1970__22_2_197_0,
     author = {Roggenkamp, K. W.},
     title = {Projective ideals in clean orders},
     journal = {Compositio Mathematica},
     pages = {197--201},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {22},
     number = {2},
     year = {1970},
     mrnumber = {269689},
     zbl = {0198.36302},
     language = {en},
     url = {http://www.numdam.org/item/CM_1970__22_2_197_0/}
}