TY - JOUR TI - Spectroscopic classification of X-ray selected stars in the 'omega' Ophiuchi star-forming region and vicinity PY - 1998 AU - Martin, E L AU - Montmerle, T AU - Gregório-Hetem, Jane AU - Casanova, S T2 - Monthly Notices of the Royal Astronomical Society DO - 10.1111/j.1365-8711.1998.01932.x UR - https://doi.org/10.1111/j.1365-8711.1998.01932.x VL - 300 IS - 3 SP - 733-746 VL - No 1998 ER -