With no explanation, label each line with "O", "other-chemicalthing", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Among
his
highest
citation
scientific
papers
are
the
discovery
and
collaborative
study
of
an
atypical
supernova
observed
in
2006
,
a
scientific
review
on
the
enigmatic
X-ray
source
Cygnus
X-3
and
its
reported
very
high
energy
emission
and
the
discovery
of
abnormal
CNO
abundances
among
accreting
magnetic
white
dwarfs
.
Among:O
his:O
highest:O
citation:O
scientific:O
papers:O
are:O
the:O
discovery:O
and:O
collaborative:O
study:O
of:O
an:O
atypical:O
supernova:O
observed:O
in:O
2006:O
,:O
a:O
scientific:O
review:O
on:O
the:O
enigmatic:O
X-ray:other-astronomything
source:other-astronomything
Cygnus:other-astronomything
X-3:other-astronomything
and:O
its:O
reported:O
very:O
high:O
energy:O
emission:O
and:O
the:O
discovery:O
of:O
abnormal:O
CNO:other-chemicalthing
abundances:O
among:O
accreting:O
magnetic:O
white:O
dwarfs:O
.:O