Hints: http://adsabs.harvard.edu/abs/1986ApJ...307..609H + http://simbad.harvard.edu/simbad/sim-ref?simbo=on&submit=submit%20bibcode&querymethod=bib&bibcode=1986ApJ...307..609H
Hints: http:// adsabs. harvard. edu/abs/ 1986ApJ. ..307.. 609H + http:// simbad. harvard. edu/simbad/ sim-ref? simbo=on& submit= submit% 20bibcode& querymethod= bib&bibcode= 1986ApJ. ..307.. 609H