1. Low and very low frequency radio wave propagation;Belrose,1968
2. COSPAR '98 Session C4.1 - Lower ionosphere measurements and models;Bilitza;IRI News,1998
3. New parameters and options for the IRI web interface;Bilitza;IRI News,1999
4. Sky-wave propagation at frequencies below 150 kHz with particular emphasis on ionospheric effects,1978
5. Radio propagation and circuit performance at frequencies below about 30 kHz,1990