1. Einstein, A., “Näherungsweise Intergation der Feldgleichungen der Gravitation”, Sitzungsberichte der Preussischen Akademie der Wissenschaften (Berlin, June 22, 1916) pp. 688-696; English translation (translated by Alfred Engel) in The Collected Papers of Albert Einstein, Volume 6: The Berlin Years: Writings, 1914-1917 (English translation supplement, Doc. 32, pp. 201-210, Princeton University Press, http://einsteinpapers.press.princeton.edu/vol6-trans).
2. A. Einstein, “Über Gravitationswellen,” Sitzungsberichte der Königlich Preussischen Akademie der Wissenschaften (Berlin, February 21, 1918) pp. 154-167; English translation (translated by Alfred Engel) in The Collected Papers of Albert Einstein, Volume 7: The Berlin Years: Writings, 1918-1921 (English translation supplement, Doc. 1 “On gravitational waves”, pp. 9-27, Princeton University Press, http://einsteinpapers.press.princeton.edu/vol7-trans).
3. Confusion noise level due to galactic and extragalactic binaries
4. Gravitational waves: Classification, methods of detection, sensitivities and sources
5. Sub-Femto-gFree Fall for Space-Based Gravitational Wave Observatories: LISA Pathfinder Results