THE REX SURVEY - A SEARCH FOR BL LAC OBJECTS

We present the scientific goals and the strategy of the REX survey, a project which has been recently initiated at the Brera Astronomical Ob servatory in Milan with the aim of selecting a large and statistically representative sample of BL Lac objects and other kinds of Radio Loud Active Galactic Nuclei. More than 1200 PSPC images (for a total of ab out 2700 square deg. of sky) have been searched for sources detected a lso in the VLA NVSS survey (as of June 1977), The data and source sele ction criteria, the cross-correlation technique and preliminary result s are presented and discussed.