@article{iiasa4325,
           title = {A philosopher's mathematician: Hans Hahn and the Vienna Circle},
       publisher = {Springer},
            year = {1995},
           pages = {16--29},
         journal = {Mathematical Intelligencer},
             url = {https://pure.iiasa.ac.at/id/eprint/4325/},
            issn = {1866-7414},
          author = {Sigmund, K.}
}