@article{HM21a,
	author   = {M.~Herrmann and K.~Matthies},
	title    = {A Uniqueness Result for a Simple Superlinear Eigenvalue},
	journal  = {J Nonlinear Sci}
	year     = {2021},
	volume   = {31},
	article  = {27},
	doi      = {10.1007/s00332-021-09683-8},
	note     = {open access}
}