Geodesic
The Lagrange multipliers method for solving a~semicoercive model problem with friction
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 12 (2009) no. 4, pp. 409-420

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In model problems with friction, unconditional minimization of a nondifferentiable functional is reduced to conditional minimization of a differentiable functional. To solve the semicoercive problem obtained, we use a dual scheme based on a modified Lagrangian functional. 
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     author = {N. N. Kushniruk and R. V. Namm},
     title = {The {Lagrange} multipliers method for solving a~semicoercive model problem with friction},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
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N. N. Kushniruk; R. V. Namm. The Lagrange multipliers method for solving a~semicoercive model problem with friction. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 12 (2009) no. 4, pp. 409-420. http://geodesic.mathdoc.fr/item/SJVM_2009_12_4_a4/