@article{zu220199,
           title = {Properties of Fibonacci-Narayana numbers},
          author = {?. ?. ??????????},
            year = {2003},
           pages = {29--36},
         journal = {On Generalized Fibonacci Quaternions and  Fibonacci-Narayana Quaternions},
             url = {http://eprints.zu.edu.ua/20199/}
}