2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54735Results of the work of S. Bruce [{\it Nuovo Cimento} {\bf 110}B (1995) 115] are compared with those of recent papers of D. V. Ahluwalia and myself, devoted to describing neutral particles of spin $j=1/2$ and $j=1$.ReVTeX file, 6pp., no figuresHigh Energy Physics - Theorytext