Päivi Ekholm

Changes in the mineral and trace element contents of cereals, fruits and vegetables in Finland

Marja-Leena Ovaskainen, Heikki Pakkala, Pirjo Mattila, 2007 .

Effects of Selenium Fertilization on the Selenium Content of Selected Finnish Fruits and Vegetables

Maija Ylinen, P. Koivistoinen, P. Ekholm, 1989 .