TY - RPRT TI - Materials trade study for lunar/gateway missions AU - Tripathi, R. K. AU - Wilson, J. W. AU - Cucinotta, F. A. AU - Anderson, B. M. AU - Simonsen, L. C. PY - 2003 UR - https://ntrs.nasa.gov/citations/20040087421 ID - 20040087421 ER -