51.   That method tracks the number of times an article is cited in subsequent studies within a year.

a. + study >>共 658
new 13.19%
recent 6.98%
further 3.76%
previous 3.06%
scientific 2.35%
earlier 2.26%
clinical 1.27%
animal 1.24%
independent 1.17%
first 1.12%
subsequent 0.40%
subsequent + n. >>共 1269
year 3.32%
meeting 2.06%
investigation 1.91%
test 1.61%
study 1.26%
report 1.14%
interview 1.06%
day 1.04%
event 0.87%
generation 0.84%
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