AMBROS, Elena. Pollen sterility in Fragaria x ananassa. In Biologia. Section A. Section B. Section C, Botany. Zoology. Cellular and molecular biology. ISSN 0006-3088. ISSN 1335-6372. ISSN 1335-6380. ISSN 1335-6399. Bratislava : Slovak Academic Press, 2003, vol. 58, no. 1, s. 103-107.