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We present a self-similar model of spherically symmetric collapse of amassless scalar field with a parameter $p$. The black hole formation isexplicitly shown to occur only in the strong-field implosion of $p >1$. Thefield evolution in the critical limit $ p \rightarrow 1 $ is compared withnumerical results found by Choptuik.Comment: DPNU-94-04 (multicol.sty was added.

Critical Behavior of Black Hole Formation in a Scalar Wave Collapse