Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Svihra, P. 1970a. K predpovedi zaciatku rojenia lykozruta smrekoveho (Ips typographus L) [Forecasting the beginning of flight of the spruce bark-beetle Ips typographus L] . Lesnictvi 16:921-930.