@article{MV_1967_19_2_a11,
     author = {J. C. Abbott},
     title = {Semi-boolean algebra},
     journal = {Matemati\v{c}ki vesnik},
     pages = {177 },
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MV_1967_19_2_a11/}
}