Liquid crystals : relaxed energies, dipoles, singular lines and singular points
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 3, pp. 415-437. 
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     title = {Liquid crystals : relaxed energies, dipoles, singular lines and singular points},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {415--437},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 17},
     number = {3},
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     zbl = {0760.49026},
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     url = {http://www.numdam.org/item/ASNSP_1990_4_17_3_415_0/}
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Giaquinta, M.; Modica, G.; Souček, J. Liquid crystals : relaxed energies, dipoles, singular lines and singular points. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 3, pp. 415-437. http://www.numdam.org/item/ASNSP_1990_4_17_3_415_0/

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