DOC. 23 MAX PLANCK AS SCIENTIST
565
[26]See Einstein
1905i
(Vol. 2,
Doc.
14)
and
Einstein 1906d
(Vol. 2,
Doc.
34).
[27]See Einstein 1907a
(Vol. 2,
Doc.
38)
and
Einstein
1914a
(Vol.
3,
Doc.
26).
[28]See
Planck 1906a.
See also
Goldberg
1976 and Max
Planck
to
Einstein, 6
July
1907
(Vol. 5,
Doc. 47),
for
more on
Planck's
early
interest
in
relativity.
[29]See
Planck
1908.
Einstein
used
Planck's
approach
to the
mechanics of
special
relativity
in his
contemporary
efforts
to
generalize
the
theory.
See
Einstein and Grossmann
1913
(Doc.
13), pp.
4-8.
[30]See Planck
1908,
pp.
1-5.
[31]Planck
1897
and
Planck
1906b, respectively.
For
Einstein's review of
the
latter
book,
see
Einstein
1906f
(Vol. 2,
Doc.
37).