Greedy Regularized Least-Squares for Multi-task Learning. - Pekka Naula; Tapio Pahikkala; Antti Airola; Tapio Salakoski (ICDM Workshops, 2011)

Learning Multi-Label Predictors under Sparsity Budget. - Pekka Naula; Tapio Pahikkala; Antti Airola; Tapio Salakoski (SCAI, 2011)

Multi-label learning under feature extraction budgets. - Pekka Naula; Antti Airola; Tapio Salakoski; Tapio Pahikkala (Pattern Recognit. Lett., 2014)

Learning Low Cost Multi-target Models by Enforcing Sparsity. - Pekka Naula; Antti Airola; Tapio Salakoski; Tapio Pahikkala (IEA/AIE, 2015)