@article{iiasa4692,
          volume = {18},
          number = {4},
           month = {December},
           title = {Nestor of mathematicians: Leopold Vietoris turns 105},
       publisher = {Springer},
            year = {1996},
         journal = {Mathematical Intelligencer},
             doi = {10.1007/BF03026753},
           pages = {47--50},
             url = {https://pure.iiasa.ac.at/id/eprint/4692/},
            issn = {1866-7414},
          author = {Sigmund, K. and Helmberg, G.}
}