@article{MV_1969_21_2_a5,
     author = {B. S. Yadav and P. B. Ramanujan},
     title = {A note on normal operators},
     journal = {Matemati\v{c}ki vesnik},
     pages = {149 },
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/MV_1969_21_2_a5/}
}