scientific article published in 1934

scientific article published in 1929

scientific article published in 1930

scientific article published in 1960

scientific article published in 1941

scientific article published in 1950

scientific article published in 1938

scientific article published in 1938

article published in 1967

scientific article published in 1937

scientific article published in 1961

scientific article published in 1933

scientific article published in 1951

scientific article published in 1966

scientific article published in 1953

scientific article published in 1936

scientific article published in 1932

scientific article published in 1955

scientific article published in 1937

scientific article published in 1935

scientific article published in 1932

scientific article published in November 1975

1954 paper by Motzkin and Schoenberg

scientific article published in 1934

doctoral dissertation by Isaac Schoenberg