TY - RPRT TI - Cost effective flat plate photovoltaic modules using light trapping AU - Bain, C. N. AU - Gordon, B. A. AU - Knasel, T. M. AU - Malinowski, R. L. PY - 1981 UR - https://ntrs.nasa.gov/citations/19810015083 ID - 19810015083 ER -