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abstract
VLB monitoring of the radio core of BL Lac at 2.8 and 3.6 cm wavelengths during 1990 has detected a new superluminal component with properties remarkably similar to those reported from 1980-1987 (Ap.J. {\bf352},81). The apparent speed is $v/c\sim3.1$ with a position angle within 3$\deg$ of previous components. The observations lend strong support to models of weak shocks in relativistic jets proposed for this source and used in the analysis of previous superluminal components.
