DOC. 22
ADDENDUM TO
DOC.
21
229
Published
in
Königlich Preußische
Akademie der
Wissenschaften (Berlin). Sitzungsberichte
(1915):
799-801. Submitted
11
November
1915, published 18
November
1915.
[1]Einstein
1915f
(Doc. 21).
See
also the annotation
to
that
paper
for
more
background.