Bühlmann tables are decompression tables developed by Dr. Albert Bühlmann, who did research into decompression theory at the Laboratory of Hyperbaric Physiology at the University Hospital in Zürich, Switzerland. The results of Bühlmann's research that began in 1959, was published in a 1983 German book entitled Decompression-Decompression Sickness. The book was regarded as the most complete public reference on decompression calculations and was used soon after in dive computer algorithms. In 1987 the SAA Bühlmann System was developed. This system used the dive tables and a set of rules so that people could dive safely and stay below their no-decompression limit. The tables are still used today and are very popular, many dive computers still use the ZHL-8 algorithm and many tables are based on the ZHL-16 algorithm.