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In the possibility theory framework, prioritized information can be logically expressed in different formats. The most usual way, used in standard possibilistic logic, is to associate necessity degrees with propositional formulas. This paper considers another representation and fusion of priorirized information using guaranteed possibility measures. Prioritized pieces of information are then represented by sets of weighted formulas, called Δ-knowledge bases, where weights are lower bounds of guaranteed possibility degrees of formulas.We first show that the basic notions of standard possibilistic logic have natural counterparts when dealing with Δ-knowledge bases. In particular we present the inference machinery, and provide syntactic, but semantically meaningful, merging of Δ-knowledge bases. In the second part of the paper, we show that distance-based merging propositional knowledge bases can be naturally encoded using Δ-knowledge bases. Moreover, this encoding is more efficient than the necessity-based encoding of distance-based merging operator.