Weberszpil, J., and J. A. Helayel-Neto. “Axiomatic Local Metric Derivatives for Low-Level Fractionality With Mittag-Leffler Eigenfunctions”. JOURNAL OF ADVANCES IN PHYSICS, vol. 13, no. 3, Mar. 2017, pp. 4751-5, doi:10.24297/jap.v13i3.5943.