no. 1
Some examples of singularities in a free boundary
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 1, pp. 133-144 
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     author = {Schaeffer, David G.},
     title = {Some examples of singularities in a free boundary},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {133--144},
     year = {1977},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 4},
     number = {1},
     mrnumber = {516201},
     zbl = {0354.35033},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1977_4_4_1_133_0/}
}
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Schaeffer, David G. Some examples of singularities in a free boundary. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 4 (1977) no. 1, pp. 133-144. https://www.numdam.org/item/ASNSP_1977_4_4_1_133_0/

[1] H. Brézis - D. Kinderlehrer, The smoothness of solutions to non-linear variational inequalities, Indiana Math. J., 23 (1974), pp. 831-844. | Zbl | MR

[2] H. Brézis, Opérateurs Maximaux Monotones, North Holland, Amsterdam, 1973.

[3] L. Caffarelli - N. Rivière, Smoothness and analyticity of free boundaries in variational inequalities, Ann. Scuola Norm. Sup. Pisa, (4), 3 (1967), pp. 289-310. | Zbl | MR | Numdam

[3'] D. Kinderlehrer, The free boundary determined by the solution to a differential equation, Indiana Math. J., 25 (1976), pp. 195-208. | Zbl | MR

[4] H. Lewy - G. Stampacchia, On the regularity of the solution of a variational inequality, Comm. Pure Appl. Math., 22 (1969), pp. 155-188. | Zbl | MR

[5] B. Malgrange, Ideals of Differentiable Functions, Oxford University Press, London, 1965. | Zbl | MR