## Not run:
# # abstract found
# cr_abstract(doi = '10.1109/TASC.2010.2088091')
#
# # doi not found
# # cr_abstract(doi = '10.5284/1011335')
#
# # abstract not found, throws warning
# # cr_abstract(doi = '10.1126/science.169.3946.635')
# # cr_abstract(doi = '10.1371/journal.pone.0033693')
# # cr_abstract(doi = '10.1007/12080.1874-1746')
#
# # cr_abstract(cr_r(1))
# ## End(Not run)
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