Authors: Hatakka, K Savilahti, E Ponka, A Meurman, JH Poussa, T Nase, L Saxelin, M Korpela, R

Citation: K. Hatakka et al., Effect of long term consumption of probiotic milk on infections in children attending day care centres: double blind, randomised trial, BR MED J, 322(7298), 2001, pp. 1327-1329

Authors: Ponka, A Maunula, L von Bonsdorff, CH Lyytikainen, O

Citation: A. Ponka et al., An outbreak of calicivirus associated with consumption of frozen raspberries, EPIDEM INFE, 123(3), 1999, pp. 469-474

Authors: Ponka, A Ekman, A

Citation: A. Ponka et A. Ekman, Insensitivity of the routine dimethylglyoxime test for detecting release of nickel from earrings, SCI TOTAL E, 224(1-3), 1998, pp. 161-165