no. 1
Energies of S 2 -valued harmonic maps on polyhedra with tangent boundary conditions
Annales de l'I.H.P. Analyse non linéaire, Tome 25 (2008) no. 1, pp. 77-103 
@article{AIHPC_2008__25_1_77_0,
     author = {Majumdar, A. and Robbins, J. M. and Zyskin, M.},
     title = {Energies of ${S}^{2}$-valued harmonic maps on polyhedra with tangent boundary conditions},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {77--103},
     year = {2008},
     publisher = {Elsevier},
     volume = {25},
     number = {1},
     doi = {10.1016/j.anihpc.2006.11.003},
     mrnumber = {2383079},
     zbl = {1141.35005},
     language = {en},
     url = {https://www.numdam.org/articles/10.1016/j.anihpc.2006.11.003/}
}
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Majumdar, A.; Robbins, J. M.; Zyskin, M. Energies of ${S}^{2}$-valued harmonic maps on polyhedra with tangent boundary conditions. Annales de l'I.H.P. Analyse non linéaire, Tome 25 (2008) no. 1, pp. 77-103. doi: 10.1016/j.anihpc.2006.11.003

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