1. Bergan , T. Comparison of numerical procedures for grouping pseudomonas bacteriophages according to lytic spectra
2. Bergan , T. A new bacteriophage typing set for Pseudomonas aeruginosa . 1. Selection procedure Acta path, microbiol. scand.
3. Zur Statistik des Plaque-Testes;Lorenz;Arch. ges. Virusforsch.,1962