Mass spectrometric study of the ortho effect in 2-substituted 4(3H)-pyrimidinones - Oksman Pentti; Stájer Géza; Bernáth Gábor; Pihlaja Kalevi; International Meeting on Structural Organic Chemistry and Its Applications to Environmental Research and the Chemistry of Peat and Humic Substances (1990) (Turku) (1990)