@article{MAN_1977__225_162936,
     author = {Kentaro Yano and Gerald D. Ludden and Masafumi Okumura},
     title = {Anti-Invariant {Submanifolds} of {Almost} {Contact} {Metric} {Manifolds.}},
     journal = {Mathematische Annalen},
     pages = {253--262},
     publisher = {mathdoc},
     volume = {225},
     year = {1977},
     zbl = {0324.53041},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__225_162936/}
}