@article{10_4064_ap_26_2_135_146,
     author = {R. J. M. Hornblower},
     title = {Subharmonic analogues of {MacLane's} classes},
     journal = {Annales Polonici Mathematici},
     pages = {135--146},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1972},
     doi = {10.4064/ap-26-2-135-146},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-26-2-135-146/}
}