howardbond on 31-Jan-2012 23:46:41 GMT about PN HaTr 4
Hello,
I noticed that an important reference on PN G335.2-03.6 (= PN HaTr 4) is not included (of course, I am the first author of the important reference!):
1990ApJ...355..568B
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View annotation on PN HaTr 4 object