TY - RPRT TI - Advances in Time-Distance Helioseismology AU - Duvall, Thomas L., Jr. AU - Beck, John G. AU - Gizon, Laurent AU - Kosovichev, Alexander F. AU - Oegerle, William PY - 2002 UR - https://ntrs.nasa.gov/citations/20020082906 ID - 20020082906 ER -