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I know you can convert every context-free grammar into Greibach normal form grammar.

But can I convert every deterministic context-free grammar into deterministic Greibach normal form grammar?

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If by deterministic GNF you mean as a deterministic grammar that is also GNF then yes, here is the paper. Normal forms of deterministic grammars

It is shown that every strict deterministic language may be given a strict deterministic grammar which is also in Greibach normal form.

EDIT Here is a paper outlining the technique to do the conversion Strict deterministic grammars and Greibach normal form

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