An inter-laboratory stability study of roll-to-roll coated flexible polymer solar modules by Gevorgyan, SA, Medford, A, Bundgaard, E, Sapkota, S, Schleiermacher, H, Zimmermann, B, Würfel, U, Chafiq, A, Lira-Cantu, M, Swonke, T, Wagner, M, Brabec, C, Haillant, O, Voroshazi, E, Aernouts, T, Steim, R, Hauch, J, Elschner, A, Pannone, M, Xiao, M, Langzettel, A, Laird, D, Lloyd, M, Rath, T, Maier, E, Trimmel, G, Hermenau, M, Menke, T, Leo, K, Rösch, R, Seeland, M, Hoppe, H, Nagle, T, Burke, K, Fell, C, Vak, D, Singh, T, Watkins, SE, Galagan, Y, Manor, A, Katz, E, Kim, T, Kim, K, Sommeling, P, Verhees, W, Veenstra, S, Riede, M, Greyson Christoforo, M, Currier, T, Shrotriya, V, Schwartz, G, Krebs, F