Delvos, Franz-Jürgen. “Harmonic Blending Approximation”.
Rev. Anal. Numér. Théor. Approx.
30, no. 2 (August 1, 2001): 151–162. Accessed April 11, 2025.
https://ictp.acad.ro/jnaat/journal/article/view/2001-vol30-no2-art4
.