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Article Contents

ABSTRACT

1.INTRODUCTION

2.THE CATALOGUE

2.1.Radio surveys and catalogues

--The 1-Jy sample

--The S4 sample

--The S5 sample

2.2.Optical surveys and catalogues

--The Palomar-Green sample

--The optical variability sample

--The optical polarization survey

2.3.X-ray surveys and catalogues

--The EMSS sample

--The EXOSAT sample

--The HEAO-1 sample

--The Slew survey sample

--The RASS sample

--The WGA and ROSATSRC catalogues

2.4.Gamma-ray catalogues

2.5.Miscellaneous objects

2.6.Uncertain and candidate BL Lac

3.STATISTICAL PROPERTIES

REFERENCES