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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1945
1
1946
1
1948
1
1949
1
1950
2
1951
3
1952
2
1953
5
1955
2
1957
8
1959
9
1960
5
1961
7
1962
5
1963
11
1964
10
1965
4
1966
5
1967
21
1968
59
1969
51
1970
72
1971
97
1972
112
1973
135
1974
143
1975
106
1976
102
1977
129
1978
85
1979
106
1980
148
1981
115
1982
132
1983
151
1984
199
1985
181
1986
129
1987
116
1988
148
1989
148
1990
154
1991
176
1992
188
1993
180
1994
187
1995
192
1996
195
1997
205
1998
214
1999
255
2000
315
2001
344
2002
424
2003
543
2004
697
2005
873
2006
1067
2007
1443
2008
1399
2009
1297
2010
1279
2011
1260
2012
1390
2013
1390
2014
1231
2015
1142
2016
1045
2017
945
2018
839
2019
885
2020
787
2021
654
2022
409
2023
318
2024
261
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Page 1
Population density and social pathology.
CALHOUN JB.
CALHOUN JB.
Sci Am. 1962 Feb;206:139-48. doi: 10.1038/scientificamerican0262-139.
Sci Am. 1962.
PMID: 13875732
No abstract available.
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Phenomena associated with population density.
CHRISTIAN JJ.
CHRISTIAN JJ.
Proc Natl Acad Sci U S A. 1961 Apr 15;47(4):428-49. doi: 10.1073/pnas.47.4.428.
Proc Natl Acad Sci U S A. 1961.
PMID: 13693391
Free PMC article.
No abstract available.
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