@article {MR2598838,
	title = {Degree spectra and immunity properties},
	journal = {MLQ Math. Log. Q.},
	volume = {56},
	number = {1},
	year = {2010},
	pages = {67{\textendash}77},
	issn = {0942-5616},
	doi = {10.1002/malq.200910001},
	url = {https://doi.org/10.1002/malq.200910001},
	author = {Csima, Barbara F. and Kalimullin, Iskander S.}
}
