Evidence for intrinsic Kerr bistability of high-Q microsphere resonators in superfluid heliumF. Treussart, V. S. Ilchenko, J.-F. Roch, J. Hare, V. Lefèvre-Seguin, J.-M Raimond and S. HarocheEur. Phys. J. D, 1 3 (1998) 235-238DOI: https://doi.org/10.1007/s100530050087