Which stabilization techniques in column generation, like penalty function approaches and dual price smoothing, can be used when subproblems are not solved optimally? (I am particularly interested in the parameter-less dual price smoothing approach proposed by Pessoa et al. (2013)1)
 Pessoa, A., Sadykov, R., Uchoa, E., Vanderbeck, F. (2013). In-Out Separation and Column Generation Stabilization by Dual Price Smoothing. Lecture Notes in Computer Science Volume 7933, 12th International Symposium on Experimental Algorithms, Rome, Italy. DOI: 10.1007/978-3-642-38527-8_31.