english articles
german articles
german books/chapters
french articles
no
yes
age range
mean age
specific age
age group: child
age group: school
age group: college, university
age group: other
101. dublicate
102. no access
103. not an article
104. language
105. target group
106. type (best practice etc)
107. not peer-reviewed
108. not a book/chapter
109. time frame
female
male
mixed
not specified
not applicable