“…\end{equation}$$The analogues in the partial differential equations (PDEs) setting (that is, replacing
with the Lapalcian
and perhaps adding some lower order terms) have also been investigated thoroughly. Some recent papers addressing (1.4) or its PDE analogue are those by Alves and Covei [
4], Corrêa [
15], Corrêa, Menezes, and Ferreira [
16], do Ó, Lorca, Sánchez, and Ubilla [
18], Goodrich [
24, 25], Stańczy [
62], Wang, Wang, and An [
63], Yan and Ma [
67], and Yan and Wang [
68]. And, likewise, some recent papers addressing (1.5) or its PDE analogue are those by Afrouzi, Chung, and Shakeri [
3], Ambrosetti and Arcoya [
5], Azzouz and Bensedik [
6], Boulaaras [
9], Boulaaras and Guefaifia [
10], Chung [
13], Delgado, Morales‐Rodrigo, Santos Júnior, and Suárez [
17], Goodrich [
26], Graef, Heidarkhani, and Kong [
39], Infante [
43, 44], and Santos Júnior and Siciliano [
61].…”