How Sommerfeld extended Bohr’s model of the atom (1913–1916) p. 141 Michael Eckert Published online: 30 January 2014 DOI: 10.1140/epjh/e2013-40052-4 AbstractPDF (325.8 KB)
On the theory of the Balmer series - Presented at the meeting on 6 December 1915 p. 157 A. Sommerfeld Published online: 30 January 2014 DOI: 10.1140/epjh/e2013-40053-8 AbstractPDF (749.5 KB)
The fine structure of Hydrogen and Hydrogen-like lines - Presented at the meeting on 8 January 1916 p. 179 A. Sommerfeld Published online: 30 January 2014 DOI: 10.1140/epjh/e2013-40054-0 AbstractPDF (742.3 KB)
Discovery of the hot Big Bang: What happened in 1948 p. 205 Phillip James Edwin Peebles Published online: 10 April 2014 DOI: 10.1140/epjh/e2014-50002-y AbstractPDF (370.7 KB)
An international campaign of the 19th century to determine the solar parallax - The US Naval expedition to the southern hemisphere 1849–1852 p. 225 Andreas Schrimpf Published online: 04 February 2014 DOI: 10.1140/epjh/e2013-40036-2 AbstractPDF (2.247 MB)
Ludwig Lange on the law of inertia p. 245 Herbert Pfister Published online: 23 December 2013 DOI: 10.1140/epjh/e2013-40039-2 AbstractPDF (165.1 KB)
On the Law of Inertia - Translation of: Ueber das Beharrungsgesetz p. 251 Ludwig Lange Published online: 23 December 2013 DOI: 10.1140/epjh/e2013-40040-5 AbstractPDF (235.6 KB)