i also recommend this
https://dmtquest.org/
He extensively collected scientific papers especially low-high frequency relationships.
He authored two books: questions for the lion tamer 1, 2
And this book too by Bentov
http://avalonlibrary.net/ebooks/Itzhak%20Bentov%20-%20Stalking%20The%20Wild%20Pendulum%20-%20On%20the%20Mechanics%20of%20Consciousness.pdf
You can also find a youtube video where his wife explains his wonderful life/sprit/unverse models.
Thanks for the links. A long time ago, I went from drug-induced to self-induced, or at least non-drug-tech! lol. They are useful to open doors, but then they may close again and I wish to open them myself :-)