https://ise-prodnr-eu-west-1-data-integration.s3-eu-west-1.amazonaws.com/legacy/ListingParticulars_f719ea7a-dc7a-42e2-82ab-e1ba1809330d.PDF (sse also page 155)
https://www.sec.gov/ix?doc=/Archives/edgar/data/1115837/000110465923046029/mbt-20221231x20f.htm#BLiquidityandCapitalResources_999397