The Appleton-Hartree formula and dispersion curves for the propagation of electromagnetic waves through an ionized medium in the presence of an external magnetic field part 1: curves for zero absorption - IOPscience. 1 de març del 1933-03-01. DOI:10.1088/0959-5309/45/2/310/meta
The Appleton-Hartree formula and dispersion curves for the propagation of electromagnetic waves through an ionized medium in the presence of an external magnetic field. Part 2: curves with collisional friction - IOPscience 1 de maig del 1934-05-01 DOI: 10.1088/0959-5309/46/3/313/meta