article by T. Bergfeld et al published January 1996 in Physics Letters B

article by J.M Link et al published October 2003 in Physics Letters B

scientific article published in June 1985

scientific article published in Physical Review Letters

scientific article published in March 1987

scientific article published in Physical Review Letters

scholarly article

scientific article published in October 1986

scientific article published in January 1987

scholarly article

scientific article published in 1992

scientific article published in Physical Review Letters

scientific article published in Physical Review Letters

article published in 1991

scientific article published in September 1985

article by J.M. Link et al published September 2005 in Physics Letters B

scientific article published in October 1985

article by H. Albrecht et al published August 1988 in Physics Letters B

scientific article published in February 1987

scholarly article

scientific article published in Physical Review Letters

scientific article published in December 1986