@article{NSJOM_2006_36_1a_3,
     author = {D. Fetcu},
     title = {Quaternionic maps between a {hyper-K\"ahler} manifold

 and a 3-almost contact manifold},
     journal = {Novi Sad Journal of Mathematics},
     pages = {21-34},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {2006},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2006_36_1a_3/}
}