TY - ECHAP AU - D. Gibson CY - Berlin, Heidelberg DO - 10.1007/3-540-12907-3_203 M1 - Lecture Notes in Physics PB - Springer Berlin Heidelberg PP - Berlin, Heidelberg PY - 1984 SN - 978-3-540-12907-3 SP - 197 EP - 201 TI - Radio observations of active stars: Direct evidence for polarity reversals? VL - 193 ER -