no. 1
Estimates of the first eigenvalue of a big cup domain of a 2-sphere
Compositio Mathematica, Tome 47 (1982) no. 1, pp. 95-100. 
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     author = {Matsuzawa, Tadayuki and Tanno, Shukichi},
     title = {Estimates of the first eigenvalue of a big cup domain of a 2-sphere},
     journal = {Compositio Mathematica},
     pages = {95--100},
     publisher = {Martinus Nijhoff Publishers},
     volume = {47},
     number = {1},
     year = {1982},
     mrnumber = {668783},
     zbl = {0498.53033},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1982__47_1_95_0/}
}
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Matsuzawa, Tadayuki; Tanno, Shukichi. Estimates of the first eigenvalue of a big cup domain of a 2-sphere. Compositio Mathematica, Tome 47 (1982) no. 1, pp. 95-100. http://archive.numdam.org/item/CM_1982__47_1_95_0/

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