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| publishing year | previous | first author | document title |
|---|---|---|---|
| 2020 | Pensando familias | Silva, Emeline Pompeo da | Relationship between siblings: the perception of the firstborn child |
| 2013 | Psicologia: Teoria e Pesquisa | Oliveira, Débora Silva | Firstborn's regression and growth in the process of becoming a sibling |