@article{BMMS_2003_26_2_a4,
     author = {Abdul Ghapor Hussin and Zazli Chik},
     title = {On
                        {Estimating} {Error} {Concentration} {Parameter} for {Circular
}                        {Functional} {Model}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2003},
     volume = {26},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2003_26_2_a4/}
}