TY - ECHAP AU - S. Saar CY - Berlin, Heidelberg DO - 10.1007/3-540-18653-0_99 M1 - Lecture Notes in Physics PB - Springer Berlin Heidelberg PP - Berlin, Heidelberg PY - 1987 SN - 978-3-540-18653-3 SP - 10 EP - 20 TI - The photospheric magnetic fields of cool stars: Recent results of survey and time-variability programs VL - 291 ER -