@article{MS2_1968__22_166033,
     author = {Jonas Ekman Fjeldstad},
     title = {An {Equation} of {Finite} {Differences,} which has {Some} {Connection} with the {Jacobian} {Thetafunctions.}},
     journal = {Mathematica Scandinavica},
     pages = {81--86},
     publisher = {mathdoc},
     volume = {22},
     year = {1968},
     zbl = {0193.06403},
     url = {http://geodesic.mathdoc.fr/item/MS2_1968__22_166033/}
}