1. The forcing of Forsythia intermedia spectabilis Khne;Broertjes;Rep. 14th internat. Hort Congr.,1956
2. Effect of photoperiod upon the vegetative growth of Weigela florida var. variegata.;Downs;Proc. Amer. Soc. Hort. Sci.,1956
3. Some effect of temperature and daylength on the breaking of winter dormancy in black currant;Hoyle;J. Horticul. Sci.,1960
4. Über das Treiben der einheimischen Bäume, speziell der Buche;Klebs;Akad. Wiss., math.-nat. Kl.,1914
5. The interaction between provenance and degree of chilling in bud-break of sugar maple;Kriebel;Silvae Genetica,1962