Power spectrum of the quasiperiodic and the aperiodic group pulse process Karel Vokurka — 1981 Kybernetika
On the group pulse processes. II. Power spectrum of the processes with independent points Karel Vokurka — 1983 Kybernetika
On the group pulse processes. III. Power spectrum of the processes with independent intervals Karel Vokurka — 1984 Kybernetika