TY - RPRT TI - A method for shock determination and classification and Helios observations of fast, intermediate and slow interplanetary shocks AU - Liu, S. AU - Marsch, E. AU - Schwenn, R. AU - Rosenbauer, H. PY - 1995 UR - https://ntrs.nasa.gov/citations/19960021433 ID - 19960021433 ER -