21-10-2019

https://physics.aps.org/synopsis-for/10.1103/PhysRevLett.123.165301

https://www.sciencedirect.com/science/article/abs/pii/S0042207X19322808

https://physics.aps.org/synopsis-for/10.1103/PhysRevLett.123.163201

http://m.engineeringnews.co.za/article/renergens-virginia-project-could-position-south-africa-as-prominent-player-in-helium-market-2019-10-17

https://timesofmalta.com/articles/view/running-out-of-gas-helium-shortage-may-force-diving-company-to-close.742710

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