Va. Izvekova et al., FREQUENCY-DEPENDENCE OF CHARACTERISTICS OF PULSARS PSR0031-07, 0320+39, 1133+16 AND 2016+28, Monthly Notices of the Royal Astronomical Society, 261(4), 1993, pp. 865-872
The relation between subpulses and the total pulse intensity of four p
ulsars is found from observations at frequencies from 30 to 1412 MHz.
The subpulses constitute a distinct component of emission, with an app
reciably different distribution of sources of emission.