The author thanks H. Miller for a careful reading of an earlier draft.
This observation prompted the author to look for a more constructive solution.
The above construction has led the author to believe that ......
The author's interest in this problem was recently rekindled by a conversation with David Lees.
To the best of the author's knowledge, the problem is still open.
The only references known to the authors are [A] and [V], where the case $A=L(E)$ is settled in the negative.
In 1988, while attempting to generalize this result, the second author noticed that ......
The paper was commenced whilst the second author held a Fullbright Fellowship.
Our first result generalizes (8) by exploiting some general facts seemingly overlooked by the aforementioned authors.
This topic has been dealt with by many authors.
A number of authors have considered, in varying degrees of generality, the problem of determining ......
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