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Letter to the Editor

Reply

Pages 117-119 | Published online: 24 Apr 2018
 

Acknowledgments

The author is thankful to Prof. Christensen for his interesting comments that have greatly helped him to understand better the nature of his results. The author also appreciates the editors for this opportunity of discussing in more detail the ideas underlying his work.

Funding

Research partially supported by Grant ECO2015-66593-P (Spain).

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