In this work we investigate the possible classes of seven-dimensional almost paracontact metric structures induced by the three-forms of $G_2^*$ structures. We write the projections that determine to which class the almost paracontact structure belongs, by using the properties of the $G_2^*$ structures. Then we study the properties that the characteristic vector field of the almost paracontact metric structure should have such that the structure belongs to a specific subclass of almost paracontact metric structures.
Şirin Aktay. "On the Relation Between $G_2^*$ Structures and Almost Paracontact Structures." J. Geom. Symmetry Phys. 56 31 - 43, 2020. https://doi.org/10.7546/jgsp-56-2020-31-43