scientific article published on 00 October 2000

scientific article published in 1971

scientific article published in 1973

scientific article published in 1966

scientific article published in 1973

scientific article published in April 1986

scientific article published in 1966

scholarly article

doctoral dissertation by András Hajnal

scientific article published in December 1997

article published in 1966

scientific article published in 1999

scientific article published in March 1978

scientific article published in 1978

scholarly article

scientific article published in 1959

scientific article published in 1961

scientific article published in 1987

scientific article published in 1966

scientific article published in June 1972

scientific article published in 2003

article

scientific article published in December 1972

scientific article published in September 1994

scientific article published in 1993