@article{IJOPCM_2009__2_1_233730,
     author = {Alodat, Naser A.},
     title = {On unequal probability sampling without replacement, sample size 2.},
     journal = {International Journal of Open Problems in Computer Science and Mathematics. IJOPCM},
     pages = {108},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {2009},
     zbl = {1204.62008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJOPCM_2009__2_1_233730/}
}