no. 2
Probabilistic approach for comparing first eigenvalues
Annales de l'I.H.P. Probabilités et statistiques, Tome 21 (1985) no. 2, pp. 147-156 
@article{AIHPB_1985__21_2_147_0,
     author = {Betz, Cristina and Gzyl, Henryk},
     title = {Probabilistic approach for comparing first eigenvalues},
     journal = {Annales de l'I.H.P. Probabilit\'es et statistiques},
     pages = {147--156},
     year = {1985},
     publisher = {Gauthier-Villars},
     volume = {21},
     number = {2},
     mrnumber = {798892},
     zbl = {0564.60071},
     language = {en},
     url = {https://www.numdam.org/item/AIHPB_1985__21_2_147_0/}
}
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Betz, Cristina; Gzyl, Henryk. Probabilistic approach for comparing first eigenvalues. Annales de l'I.H.P. Probabilités et statistiques, Tome 21 (1985) no. 2, pp. 147-156. https://www.numdam.org/item/AIHPB_1985__21_2_147_0/

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