Hello every one,

I have cited one reference as:

"Barabash V, Kirkwood S, Feofilov A, Kutepov A (2004) Polar mesosphere summer echoes during the July 2000 solar proton event. Ann. Geophys 22: 759–771

https://www.ann-geophys.net/22/759/2004/"

The reference style is similar to the rest of references in the manuscript. The editor has asked me to provide the 'accessed date' for the above reference.

If any one know about it then kindly share the information and also what is the importance of the 'accessed date' in citation.

Thanks

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