Van der Eerden LJM, Dueck TA, Berdowski JJM, Greven H, van Dobben HF. Influence of HN3 and (HN4)2 SO4 on heathland vegetation. Atic Bot Neerl. 1991  ;40:281-296.

van der Eerdern LJ, Dueck TA, Berdowski JJM, Greven H, van Dobben HF. Influence of NH3 and (NH4)2SO4 on heathland vegetation. Acta Bot. Neerl. 1991  ;40.