@article{ASENS_1978_4_11_2_247_0,
     author = {Piene, Ragni},
     title = {Polar classes of singular varieties},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {247--276},
     publisher = {Elsevier},
     volume = {Ser. 4, 11},
     number = {2},
     year = {1978},
     doi = {10.24033/asens.1346},
     mrnumber = {80j:14051},
     zbl = {0401.14007},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.1346/}
}