Studies on the lichen genus Usnea in East Fennoscandia and Pacific North AmericaPekka Halonen · First published 2000Open the Tome
Laboratory Diagnosis of Infectious Diseases Principles and PracticeEdwin H. Lennette, Pekka Halonen, Frederick A. Murphy · First published 1988Open the Tome
Normal and pathological firing pattern of single motor units in manJukka-Pekka Halonen · First published 1982Open the Tome
