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Multiple blow-up solutions for the Liouville equation with singular data

We study the existence of solutions with multiple concentration to the following boundary value problem $$-Δu=\e^2 e^u-4π\sum_{p\in Z}α_p δ_{p}\;\hbox{in} Ω,\quad u=0 \;\hbox{on}\partial Ω,$$ where $Ω$ is a smooth and bounded domain in $\R^2$, $α_{p}$'s are positive numbers, $Z\subset Ω$ is a finite set, $δ_p$ defines the Dirac mass at $p$, and $\e>0$ is a small parameter. In particular we extend the result of Del-Pino-Kowalczyk-Musso (\cite{delkomu}) to the case of several singular sources. More precisely we prove that, under suitable restrictions on the weights $α_p$, a solution exists with a number of blow-up points $ξ_j\in Ω\setminus Z$ up to $\sum_{p\in Z}\max\{n\in\N\,|\, n<1+α_p\}$.