Sentence examples for this previously was from inspiring English sources

Peak concentrations of NH4 + occur during autumn/winter, concurrent with fertilizer input from regional agricultural activity; this previously was reported in nearby coastal lagoons, such as the Topolobampo system (Ayala-Rodríguez 2008) and the San Ignacio Navachiste Macapule complex (Escobedo-Urías et al. 1999; Poot-Delgado 2006).

However, this previously was extensively studied and supported from our prior studies [ 6, 21].

This article previously was published in Today's Zaman.

None of this has previously been made public.

This has previously been debated in Congress, but that was more than ten years ago.

This has previously been proven by Suzuki et al [16].

This has previously been described in detail in [16].

This has previously been discussed thoroughly.

This had previously been suggested [ 18].

This has previously been reported elsewhere.

This move had previously been delayed.