@article{10_4064_fm_82_2_167_174,
     author = {Dirk van Dalen},
     title = {A model for {HAS.} {A} topological interpretation of the theory of species of natural numbers},
     journal = {Fundamenta Mathematicae},
     pages = {167--174},
     publisher = {mathdoc},
     volume = {82},
     number = {2},
     year = {1974},
     doi = {10.4064/fm-82-2-167-174},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-82-2-167-174/}
}