@article{MV_1971_23_1_a42,
     author = {M. A. Wotulo},
     title = {One new kind of  irregular spectra},
     journal = {Matemati\v{c}ki vesnik},
     pages = {357 },
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/MV_1971_23_1_a42/}
}