@article{10_4153_CJM_2006_016_0,
     author = {Jakobson, Dmitry and Nadirashvili, Nikolai and Polterovich, Iosif},
     title = {Extremal {Metric} for the {First} {Eigenvalue} on a {Klein} {Bottle}},
     journal = {Canadian journal of mathematics},
     pages = {381--400},
     year = {2006},
     volume = {58},
     number = {2},
     doi = {10.4153/CJM-2006-016-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2006-016-0/}
}