1. Electron and nuclear counters theory and use;Korff,1955
2. An Investigation of the Properties of Proportional Counters. I
3. The Operation of Proportional Counters
4. Counting tubes;Curran,1949
5. A methane proportional counter system for natural radiocarbon measurements;Diethorn;U.S. At. en. comm. Report NYO-6628,1956