@article{10_4064_cm112_1_7,
     author = {M. S. Lucido and M. R. Pournaki},
     title = {Probability that an element of a finite group has a
square root},
     journal = {Colloquium Mathematicum},
     pages = {147--155},
     publisher = {mathdoc},
     volume = {112},
     number = {1},
     year = {2008},
     doi = {10.4064/cm112-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm112-1-7/}
}