Einstein: His Life and Universe

. Einstein to Mileva Mari

, Apr. 4, 1901.

23

. Einstein to Heike Kamerlingh Onnes, Apr. 12, 1901; Einstein to Marcel Grossmann, Apr. 14, 1901; Folsing, 78; Clark, 66; Miller 2001, 68.

24

. Einstein to Wilhelm Ostwald, Mar. 19, Apr. 3, 1901.

25

. Hermann Einstein to Wilhelm Ostwald, Apr. 13, 1901.

26

. Einstein to Mileva Mari

, Mar. 23, Mar. 27, 1901; Einstein to Marcel Grossmann, Apr. 14, 1901.

27

. Einstein to Mileva Mari

, Mar. 27, 1901; Mileva Mari

to Helene Savi

, Dec. 9, 1901.

28

. Einstein to Mileva Mari

, Apr. 4, 1901; Einstein to Michele Besso, June 23, 1918; Overbye, 25; Miller 2001, 78; Folsing, 115.

29

. Einstein to Mileva Mari

, Mar. 27, Apr. 4, 1901.

30

. Einstein to Marcel Grossmann, Apr. 14, 1901; Einstein to Mileva Mari

, Apr. 15, 1901.

31

. Einstein to Mileva Mari

, Apr. 30, 1901. The official translation is “blue nightshirt,” but the word that Einstein actually used,

Schlafrock

, translates more accurately as “dressing gown.”

32

. Mileva Mari

to Einstein, May 2, 1901.

33

. Mileva Mari

to Helene Savi

, second half of May, 1901.