"are attested to" is a correct and usable phrase in written English.
You can use this phrase when you are trying to indicate that something has been formally acknowledged or certified. For example: "The extraordinary academic achievements of the students at Jameson High School are attested to by their outstanding SAT scores."
Phrygia's relations with Assyria are attested to by Assyrian documents.
The manifold architectural abilities of Brunelleschi also are attested to by his military architecture, some of which is partially extant.
The more difficult aspects of his personality are attested to, always with great affection, by friends, fellow musicians, collaborators and two of the women who shared his life.
Neo-Hittite kings of the 9th century often bore the names of their imperial predecessors; an inscription at Boybeypınarı mentions both a Suppiluliumas and a Hattusilis; at Patina, kings with the names Labarnas and Suppiluliumas are attested to by Assyrian sources; and during the long reign of a well-documented dynasty in Gurgum two kings were called Muwatallis.
The validity of our asymptotic results in (21a) and (21b) are attested to in the figure, where the asymptotic curves correctly predict the diversity order and the array gain of the exact SER. Figure 2 Outage probability.
Large timber ships, called long ships, perhaps similar to the Viking ships of the same name, are attested to in a variety of sources.
"The reports are supposed to be complete, and you are attesting to that when you file them," he said Wednesday.
Overall, a clear increase in performance can be attested to the scenario that includes heterogeneous porosity.
But, fanciful as it sounds, sperm-squeezing is attested to by another source.
The cultural heterogeneity of the EU is attested to by 30m Muslims already within its borders.
That was attested to by CNN closing down its Afghanistan operation this week.
