However, it’s important to clarify a key fact:
It sounds like you’re looking for a paper (or information to write one) about the diccionario etimologico rae
That said, the most famous and authoritative etymological dictionary for Spanish is (later expanded by José Antonio Pascual). The RAE often relies on Corominas’s work. However, it’s important to clarify a key fact:
Instead, the RAE’s etymological information is embedded within its flagship dictionary: the Diccionario de la Lengua Española (DLE). For each entry, the DLE includes a brief etymological note in square brackets [ ] indicating the word’s origin (e.g., Latin, Arabic, Greek, a Germanic language, etc.). a Germanic language