Journée, M., Bach, F. H., Absil, P.-A., & Sepulchre, R. (2010). Refining Sparse Principal Components. In Moritz Diehl (ed.), Recent Advances in Optimization and its Applications in Engineering (p. p. 165-171). Springer. https://doi.org/10.1007/978-3-642-12598-0_14