@article{MV_1969_21_3_a10,
     author = {Z. A. Ivkovi\'c},
     title = {An elementary property of conditional mathematical expectation. {Application} to the linear regularity of stochastic processes},
     journal = {Matemati\v{c}ki vesnik},
     pages = {331 },
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/MV_1969_21_3_a10/}
}