For Hartshorne's appreciation of Fechner see his Aquinas to Whitehead – Seven Centuries of Metafysics of Religion. Hartshorne also comments that William James failed to do justice to the theological aspects of Fechner's work. Hartshorne saw also resemblances with the work of Fechner's contemporary Jules Lequier. See also: Hartshorne – Reese (ed.) Philosophers speak of God.
archive.org
Fechner, G. (1876) Vorschule der Aesthetik. Leipzig: Breitkopf und Hartel. Website: chuoft.pdf
arxiv.org
Wallis, K.F. (2014). "The two-piece normal, binormal, or double Gaussian distribution: its origin and rediscoveries". Statistical Science, Vol. 29, No. 1, pp.106-112. DOI: 10.1214/13-STS417 arXiv:1405.4995