estuvieron refiriendo
-they/you were referring
Preterite progressive ellos/ellas/ustedes conjugation of referir.

referir

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De hecho, Florinda y Castaneda se estuvieron refiriendo a las Hermanitas como si aún anduvieran por aquí, en los seminarios y en charlas que dieron hasta final de 1994.]
In fact Florinda and Castaneda were still referring to the Little Sisters as still being around at workshops and lectures through the end of 1994.]
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