Variable selection in spectroscopy... this is neverending nightmare for many chemometricians. Two new approaches are proposed: clustering of variables  and fused stagewise regression .
M. Farrokhnia, and S. Karimi, "Variable selection in multivariate calibration based on clustering of variable concept", Analytica Chimica Acta, vol. 902, pp. 70-81, 2016. http://dx.doi.org/10.1016/j.aca.2015.11.002
B. Malli, and T. Natschläger, "Fused stagewise regression — A waveband selection algorithm for spectroscopy", Chemometrics and Intelligent Laboratory Systems, vol. 149, pp. 53-65, 2015. http://dx.doi.org/10.1016/j.chemolab.2015.09.004