Geodesic
Fundamental groups of spaces of generalized perfect splines
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 15 (2009) no. 1, pp. 159-165

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The fundamental groups $\pi_1(\Omega_n)$ of the spaces $\Omega_n$ of generalized perfect splines are calculated. For $n\ge2$, the groups are trivial; $\pi_1(\Omega_1)$ is a free group with three generators.
Keywords: generalized perfect splines, fundamental groups. 
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     author = {V. A. Koshcheev},
     title = {Fundamental groups of spaces of generalized perfect splines},
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     publisher = {mathdoc},
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     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2009_15_1_a12/}
}
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V. A. Koshcheev. Fundamental groups of spaces of generalized perfect splines. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 15 (2009) no. 1, pp. 159-165. http://geodesic.mathdoc.fr/item/TIMM_2009_15_1_a12/