@article {roy1995evaluation,
	title = {An evaluation of methods designed to calculate energy levels in a selected range and application to a (one-dimensional) Morse oscillator and (three-dimensional) HCN/HNC},
	journal = {The Journal of chemical physics},
	volume = {103},
	year = {1995},
	pages = {5600{\textendash}5612},
	publisher = {AIP},
	author = {Roy, Pierre-Nicholas and Carrington Jr, Tucker}
}
