The first certain reference to the city dates to 1256.

There were certain references to sums of money, checked along with specified dates.

In the control systems one or more output variables of a system need to follow a certain reference over time.

However, in certain later references, the y somehow got turned into the z.

It could not have been written after 360 because of certain references to Church fathers in the margin.

Almost nothing is known about the early history of Inchkeith, and there is no certain reference to the island until the 12th century.

This is an important subject for certain references which we have heard subsequently.

Therefore, certain references do not seem necessary to us, such as its not exceeding 2003.

This may seem intuitive but confusion can arise when using certain references while integrating data from different sources.

The stories on all story arcs are completely different but sometimes makes certain references from each season.