@article{Smolentsev2017left-invariant,
author={Smolentsev, N.K.},
title={LEFT-INVARIANT ALMOST PARA-COMPLEX EINSTEINIAN STRUCTURES ON SIX-DIMENSIONAL NILPOTENT LIE GROUPS},
journal={Science Evolution},
publisher={Kemerovo State University},
year={2017},
pages={88-95},
volume={2},
issue={2},
}