@article{10_4153_CJM_2012_045_3,
     author = {Guardo, Elena and Harbourne, Brian and Tuyl, Adam Van},
     title = {Symbolic {Powers} {Versus} {Regular} {Powers} of {Ideals} of {General} {Points} in {P1} {\texttimes} {P1}},
     journal = {Canadian journal of mathematics},
     pages = {823--842},
     year = {2013},
     volume = {65},
     number = {4},
     doi = {10.4153/CJM-2012-045-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2012-045-3/}
}