@article{MS2_1979__44_166634,
     author = {Friedrich Hegenbarth},
     title = {On a certain formula for exotic characteristic classes {I.}},
     journal = {Mathematica Scandinavica},
     pages = {73--91},
     publisher = {mathdoc},
     volume = {44},
     year = {1979},
     zbl = {0416.55009},
     url = {http://geodesic.mathdoc.fr/item/MS2_1979__44_166634/}
}