. 2020 Jul 20;11(7):699. doi: 10.3390/mi11070699
© 2020 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Figure 2.
The functions (A) G1 and (B) G2 from [56].