@article{Cai:1996a,
	key = "Cai 1996a",
	author = "T. Cai",
	title = "On $2$-{Niven} and $3$-{Niven} numbers",
	journal = FQ,
	volume = 34,
	year = "{\noopsort{1996a}}1996",
	pages = "118-120",
	comment = "checked"}

@article{Kennedy:1982,
	key = "Kennedy 1982",
	author = "R. E. Kennedy",
	title = "Digital sums, {Niven} numbers, and natural density",
	journal = CRUXM,
	volume = 8,
	year = 1982,
	pages = "129-133"}

@article{Cooper&Kennedy:1989,
	key = "Cooper and Kennedy 1989",
	author = "C. N. Cooper and R. E. Kennedy",
	title = "Chebyshev's inequality and natural density",
	journal = AMM,
	volume = 96,
	year = 1989,
	pages = "118-124",
	comment = "checked"}

@article{Kennedy&Cooper:1984,
	key = "Kennedy and Cooper 1984",
	author = "R. E. Kennedy and C. N. Cooper",
	title = "On the natural density of the {Niven} numbers",
	journal = COLMJ,
	volume = 15,
	year = 1984,
	pages = "309-312"}

@article{Cooper&Kennedy:1988,
	key = "Cooper and Kennedy 1988",
	author = "C. N. Cooper and R. E. Kennedy",
	title = "A partial asymptotic formula for the {Niven} numbers",
	journal = FQ,
	volume = 26,
	year = 1988,
	pages = "163-168",
	comment = "checked"}

@article{Kennedy&Cooper:1989a,
	key = "Kennedy and Cooper 1989a",
	author = "R. E. Kennedy and C. N. Cooper",
	title = "Niven repunits and {$10^n \equiv 1$ (mod $n$)}",
	journal = FQ,
	volume = 27,
	year = "{\noopsort{1989a}}1989",
	pages = "139-143",
	comment = "checked"}

@article{Grundman:1994,
	key = "Grundman 1994",
	author = "H. G. Grundman",
	title = "Sequences of consecutive $n$-{Niven} numbers",
	journal = FQ,
	volume = 32,
	year = 1994,
	pages = "174-175",
	comment = "checked"}

@article{Cooper&Kennedy:1993,
	key = "Cooper and Kennedy 1993",
	author = "C. N. Cooper and R. E. Kennedy",
	title = "On consecutive {Niven} numbers",
	journal = FQ,
	volume = 31,
	year = 1993,
	pages = "146-151",
	comment = "checked"}

@article{Cooper&Kennedy:1985,
	key = "Cooper and Kennedy 1985",
	author = "C. N. Cooper and R. E. Kennedy",
	title = "On an asymptotic formula for the {Niven} numbers",
	journal = IJMMS,
	volume = 8,
	year = 1985,
	pages = "537-543"}

@article{Kennedy&Goodman&Best:1980,
	key = "Kennedy, Goodman, and Best 1980",
	author = "R. E. Kennedy and T. A. Goodman and C. A. Best",
	title = "Mathematical discovery and {Niven} numbers",
	journal = MATYC,
	volume = 14,
	number = 3,
	year = "{\noopsort{1980}}Winter 1980",
	pages = "20-25"}