Robin Forman. The Euler Characteristic Is the Unique Locally Determined Numerical Invariant of Finite Simplicial Complexes which Assigns the Same Number to Every Cone. Discrete & Computational Geometry, 23(4):485-488, 2000. [doi]
@article{Forman00-0, title = {The Euler Characteristic Is the Unique Locally Determined Numerical Invariant of Finite Simplicial Complexes which Assigns the Same Number to Every Cone}, author = {Robin Forman}, year = {2000}, doi = {10.1007/s004540010016}, url = {https://doi.org/10.1007/s004540010016}, researchr = {https://researchr.org/publication/Forman00-0}, cites = {0}, citedby = {0}, journal = {Discrete & Computational Geometry}, volume = {23}, number = {4}, pages = {485-488}, }