EN
We prove that the quasi-Banach spaces $ℓ_{p}(c₀)$ and $ℓ_{p}(ℓ₂)$ (0 < p < 1) have a unique unconditional basis up to permutation. Bourgain, Casazza, Lindenstrauss and Tzafriri have previously proved that the same is true for the respective Banach envelopes $ℓ₁(c₀)$ and ℓ₁(ℓ₂). They used duality techniques which are not available in the non-locally convex case.