This author has not been identified. Look up 'Timo Viitanen' in GoogleThis author has not been identified. Look up 'Janne Helkala' in GoogleThis author has not been identified. Look up 'Heikki Kultala' in GoogleThis author has not been identified. Look up 'Pekka Jääskeläinen' in GoogleThis author has not been identified. Look up 'Jarmo Takala' in GoogleThis author has not been identified. It may be one of the following persons: Look up ' Tommi Zetterman' in GoogleThis author has not been identified. Look up 'Heikki Berg' in Google