TY - GEN TY - GEN T1 - Positron annihilation and cluster formation in nitrogen fluid T2 - Report / Helsinki University of Technology. Laboratory of Physics A1 - Rytsölä, Klaus, 1947- A2 - Rantapuska, Kari, 1955- A2 - Hautojärvi, P., 1944- LA - eng PP - Espoo PB - Helsinki University of Technology YR - 1983 UL - https://kansalliskirjasto.finna.fi/Record/fikka.3262079 ER -