@article{AIF_2011__61_4_1539_0,
     author = {Borodzik, Maciej and Zo{\l}\k{a}dek, Henryk},
     title = {Number of singular points of an annulus in $\mathbb{C}^2$},
     journal = {Annales de l'Institut Fourier},
     pages = {1539--1555},
     year = {2011},
     publisher = {Association des Annales de l'Institut Fourier},
     volume = {61},
     number = {4},
     doi = {10.5802/aif.2650},
     zbl = {1238.14049},
     mrnumber = {2951503},
     language = {en},
     url = {https://www.numdam.org/articles/10.5802/aif.2650/}
}