CMB-S4: forecasting constraints on primordial gravitational waves by Abazajian, K, Addison, GE, Adshead, P, Alonso, D

CMBPol Mission Concept Study: Probing Inflation with CMB Polarization by Baumann, D, Jackson, MG, Adshead, P, Amblard, A, Ashoorioon, A, Bartolo, N, Bean, R, Beltran, M, Bernardis, F, Bird, S, Chen, X, Chung, D, Colombo, L, Cooray, A, Creminelli, P, Dodelson, S, Dunkley, J, Dvorkin, C, Easther, R, Finelli, F, Flauger, R, Hertzberg, M, Jones-Smith, K, Kachru, S, Kadota, K