@article{10_1017_S0017089500030044,
     author = {Luca, Florian and Mignotte, Maurice and Roy, Yves},
     title = {On the equation \ x^y\pm y^x=\prod n_i!},
     journal = {Glasgow mathematical journal},
     pages = {351--357},
     year = {2000},
     volume = {42},
     number = {3},
     doi = {10.1017/S0017089500030044},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500030044/}
}