"The most plausible theory so far is by Hans Westgeest. He demonstrates that the theme has the same contours as the melody from the second movement of Beethoven's Sonata Pathétique. The link can indeed be demonstrated and the connection with the anecdote of Augustus Jaeger gives the link credibility." (transl.) Prof. Dr. Francis Maes (University Ghent). Program note Concertgebouw Brugge (BBC Scottish Symphony Orchestra, cond. Martyn Brabbins, 3 June 2018).
McClelland, Clive (2007). "Shadows of the evening: new light on Elgar's "dark saying"". The Musical Times. 148 (1901): 43–48. doi:10.2307/25434495. JSTOR25434495.
Turner 2007, pp. 111–116 (reviewed in The Elgar Society Journal, March 1999). Turner, Patrick (2007). Elgar's 'Enigma' Variations – A Centenary Celebration (second ed.). London: Thames Publishing.
Westrup, J. A., "Elgar's Enigma", Proceedings of the Royal Musical Association, 86th Sess. (1959–1960), pp. 79–97, Taylor & Francis for the Royal Musical Association, accessed 2 December 2010 (subscription required)
McClelland, Clive (2007). "Shadows of the evening: new light on Elgar's "dark saying"". The Musical Times. 148 (1901): 43–48. doi:10.2307/25434495. JSTOR25434495.