Environments of QSOs at intermediate redshifts
  A preliminary analysis of fields around 20 mainly radio-quiet QSOs (RQQs) at intermediate redshift is summarized. We find overdensities of faint sources around 50% of our observed QSOs suggesting that they are located in groups or even clusters of galaxies. 
Klaus Jaeger (1), Klaus J. Fricke (1), Jochen Heidt (2)   ((1)Universitaets-Sternwarte Goettingen, (2) Landessternwarte Heid...