For instance those of Alex Gamma, FIT Zurich: https://ee.ethz.ch/de/departement/personen-a-bis-z/person-detail.MTMwNzkw.TGlzdC8zMjc5LC0xNjUwNTg5ODIw.html published on researchgate.net: https://www.researchgate.net/profile/Alex-Gamma as for instance this paper: «The Minimal Phenomenal Experience questionnaire (MPE-92M): Towards a phenomenological profile of “pure awareness” experiences in meditators» https://pubmed.ncbi.nlm.nih.gov/34260614 Or those of Johannes Bader, FIT Zurich : https://www.sop.tik.ee.ethz.ch/people/baderj/index.html Which are published on Google Scholar: https://scholar.google.com/citations?hl=en&user=K7g7_S8AAAAJ&view_op=list_works&sortby=pubdate What is your opinion …