Let us note (for later reference) that ......
We quote for future reference another result of Fox: there exists ......
For these considerations it will be convenient to state beforehand, for easy reference, the following variant of ......
We have thus proved the theorem without any reference to integration.
If $G$ is clear from context, then we suppress reference to it in the notation.
The best general reference $\langle$An excellent recent reference$\rangle$ for ...... is [5].
The following proposition is probably well known, but we do not have a reference.
At the time of writing [5], I was not aware of this reference.
Where it is possible, we outline the proofs so that the reader will not have to hunt for obscure references.
For a comprehensive treatment and for references to the extensive literature on the subject one may refer to the book [M] by Markov.
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