References
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Probable observation of a supersolid helium phase,
, Nature, 1/2004, Volume 427, Issue 6971, p.225 - 227, (2004)
The positions of lanthanum (actinium) and lutetium (lawrencium) in the periodic table,
, Journal of Chemical Education, 08/1982, Volume 59, Issue 8, p.634-636, (1982)
