Temperature Variations and N/O in the Orion Nebula from HST Observations
Journal article published in 1998 by
R.~H Rubin,
P.~G Martin,
R.~J Dufour,
G.~J Ferland 
,
J.~A Baldwin,
J.~J Hester,
D.~K Walter
,
J.~A Baldwin,
J.~J Hester,
D.~K Walter
