“…Relativistic oscillators [1,8,19], low-energy bound state systems [5,6,[21][22][23] in quantum electrodynamics and "free" test fields [9,17] can be considered among the mentioned quantum mechanical systems. The relativistic oscillators can be categorised as Dirac oscillator [24], Klein-Gordon oscillator [25], Duffin-Kemmer-Petiau oscillator [26] and vector boson oscillator [19,27,28]. The others were introduced by inspiration from the Dirac oscillator.…”