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I am describing a part of literature in introduction of my paper with the following way(I studied on effect of blade thickness in CFD methods):

A few authors experimentally investigated the effect of blade thickness on the Wells turbine performance. They changed the blade thickness from hub to tip in their work.........((two authors investigated))

Despite prior authors, a few authors also kept blade thickness constant from hub to tip in their experimental study. Takao et al. [13] .....((three authors investigated))

As revealed above, in the past two decades, many investigations on blade thickness of the Wells turbine are performed by experimental studies. But there is a difficulty in the interpretation of experimental results because.......So, by using CFD methods, many efforts is performed in order to overcome ......[9, 16, 17]...((only two authors regarding the blade thickness investigated))

As described above, a few authors investigated the effect of blade thickness on Wells turbine performance by using CFD methods.

I think that I used "A few" too much. I am grateful for suggested ways to make it clearer and better. Could you please suggest some words to replace "A few" and "Despite"?

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    Try some authors. Also, look closely at this: "...many efforts is performed..." – P. E. Dant Reinstate Monica Nov 11 '16 at 18:52
  • Thanks. regarding "Despite", could you please suggest some words to replace it? i think that use of "Despite prior authors" is inappropriate. – user19061 Nov 11 '16 at 19:47
  • I think you could omit "Despite..." completely without losing any clarity. If you want to emphasize the difference from the previous paragraph, you could write something like "Other authors kept blade thickness constant ...". – Wim Lewis Nov 11 '16 at 20:23
  • You should consult a dictionary to learn the meaning and usage of despite. You're correct: it won't work here. "Some authors", "prior authors", or if appropriate "many authors" or "some sources", all are possible. You could write: "In contrast to many prior authors, a few also kept blade thickness constant..." This avoids the repetition of "authors". – P. E. Dant Reinstate Monica Nov 11 '16 at 20:41
  • Is "a few authors" always the same group of people? If so, I would just use it the first time, and after that use "these (same) authors" (or something like this) to refer back to "a few authors". If not, I would consider some way to define the groups better to actually describe them and any differences. – user3169 Nov 12 '16 at 1:33
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You might want to replace recurrent "a few" with "some" or "several". Also replace "despite" with "apart from" in the second paragraph.

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