Other Zircon/Helium Rebuttals: https://www.reddit.com/r/askscience/comments/pbv3e/why_would_15_billion_year_old_zircon_crystals/ https://www.oldearth.org/RATE_critique_he-zr.htm#[4] http://www.talkorigins.org/faqs/helium/zircons.html
A few Research Papers on the topic: https://www.sciencedirect.com/science/article/abs/pii/S0016703720300727 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5302874/ https://www.ajsonline.org/content/313/3/145.full https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjn2N7gnc3wAhX3AZ0JHWfAAK0QFjATegQIEhAD&url=https%3A%2F%2Fwww.geo.arizona.edu%2F~reiners%2FReinersch6.pdf&usg=AOvVaw0H07E7J3TBnBwejVDe467y
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