https://jnfa.mathres.org/archives/2408 2020-12-30T01:10:29+00:00 monthly 0.2 https://jnfa.mathres.org/archives/2398 2021-02-01T14:30:57+00:00 monthly 0.2 https://jnfa.mathres.org/archives/2392 2020-12-02T05:40:03+00:00 monthly 0.2