@article{VM_2012_14_2_a2,
     author = {Alexey Stakhov},
     title = {A generalization of the {Cassini} formula},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/VM_2012_14_2_a2/}
}