Comparison of Initialization Techniques for the Accurate Extraction of Muscle Synergies from Myoelectric Signals via Nonnegative Matrix Factorization. - Soomro, Mumtaz Hussain; Conforto, Silvia; Giunta, Gaetano; Ranaldi, Simone; De Marchis, Cristiano (Applied Bionics & Biomechanics, 2018)