The phrase "some required" is correct and usable in written English.
For example, you could use it in a sentence like this: "I have some required documents I must submit to apply for this job."
An industrial park which was not completed to contract requirements and in which some required systems had not been built.
Some required egg whites for body, he adds, laughing, and some required "two cans of hair spray".
Some required airport changes are not obvious.
But after learning he would have to go to Manhattan to obtain some required documents, he let the idea go.
These groups some voluntary and some required by law can be viewed as prototypes of the medieval guilds.
Prior to entering results, the ClinicalTrials.gov record must be updated with some required information prior to beginning results reporting.
To remove the boards, he had fitted a saw with a thin blade to slice the nails attaching them to the wall; some required a crowbar.
The method generalizes several previous non-diagonal MIMO QFT techniques, avoiding some required prior hypotheses of such former methods, and simplifies the design procedure.
Some required upkeep includes replacing windshield wipers, suspension and tire rotation.
In Section 2, we give our basic notation and recall some required results.
