Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Lupe, I., and e. al. 1963. Studies in the hydrology and rehabilitation of oak woods suffering from die-back in Livad and Noroieni [In Romanian, Russian, German, English summaries]. Stud. Cerc. Inst. Cerc. For., Bucuresti 23B:73-94.