Update repositories.md

Author: marespadafor

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 ### Replication Materials
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 - The negative consequences of gambling opportunities on human capital formation: Evidence from Spain, with Sergi Martínez. [Replication materials](http://github.com/marespadafor/replication_gambling). Access to the paper
+- Selectivity and risks along educational transitions in Europe, with Fabrizio Bernardi, Ilaria Lievore & Manuel T. Valdés. MapIneq Deliverable D3.3. [Replication materials](https://github.com/marespadafor/Mapineq_D3.3_Selectivity). [Paper (Zenodo)](https://doi.org/10.5281/zenodo.10868079)
 
 ### Original data
 - [Panel data on Madrid High Schools (2013-2018)](https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/K4NSBK)