Doddabhadrappla Gowda P, Mallesha Naik D, Malleshrao Ravindranatha A, Venkatesha V.  Riemann solitons on $(\kappa, \mu)$-almost cosymplectic manifolds.  Commun. Korean Math. Soc. 2023;38:881-892.  https://doi.org/10.4134/CKMS.c220243