@article{MV_1970_22_1_a6,
     author = {W. E. Mientka and R. L. Vogt},
     title = {Computational results relating to problems concerning $\sigma (n)$},
     journal = {Matemati\v{c}ki vesnik},
     pages = {35 },
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/MV_1970_22_1_a6/}
}