Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Dynode:

"

The dynode takes its name from the dynatron. Albert Hull did not use the term dynode in his 1918 paper on the dynatron,[1] but used the term extensively in his 1922 paper.[2] In the latter paper, he defined a dynode as a "plate that emits impact electrons ... when it is part of a dynatron."