citation_journal_title=Journal of Physics A; citation_author=C. X. Chuan; citation_volume=23; citation_publication_date=1990; citation_pages=L659; citation_id=CR1
citation_journal_title=Revista Brasileira de Fisica; citation_author=E. D. Filho; citation_volume=20; citation_publication_date=1990; citation_pages=258; citation_id=CR2
citation_journal_title=American Journal of Physics; citation_author=R. H. Haymaker, A. R. P. Rau; citation_volume=54; citation_publication_date=1986; citation_pages=928; citation_id=CR3
citation_journal_title=Nuovo Cimento B; citation_author=A. Jannussis, I. Tsohantzis, D. Vavougios; citation_volume=105; citation_publication_date=1990; citation_pages=1171; citation_id=CR4
citation_journal_title=Physical Review A; citation_author=V. A. Kostelecky, M. M. Nieto; citation_volume=32; citation_publication_date=1985; citation_pages=1293; citation_id=CR5
citation_journal_title=Nuovo Cimento A; citation_author=A. Lahiri, P. K. Roy, B. Bagchi; citation_volume=100; citation_publication_date=1988; citation_pages=747; citation_id=CR6
citation_journal_title=International Journal of Modem Physics A; citation_author=A. Lahiri, P. K. Roy, B. Bagchi; citation_volume=5; citation_publication_date=1990; citation_pages=1383; citation_id=CR7
citation_journal_title=Fortschritte der Physik; citation_author=B. Roy, P. Roy, R. K. Roychowdhury; citation_volume=39; citation_publication_date=1991; citation_pages=211; citation_id=CR8
citation_journal_title=Hadronic Journal; citation_author=R. Santilli; citation_volume=2; citation_publication_date=1979; citation_pages=1460; citation_id=CR9
citation_journal_title=Journal of Physics A; citation_author=C. V. Sukumar; citation_volume=18; citation_publication_date=1985; citation_pages=L57; citation_id=CR10
citation_journal_title=Nuclear Physics B; citation_author=E. Witten; citation_volume=188; citation_publication_date=1981; citation_pages=513; citation_id=CR11