Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Pishchik, A. A. 1978. Ob urozhae na postoyannykh lesosemennykh uchastkakh sosny obyknovennoi [The seed yield in permanent seed stands of Scots pine] . Lesnoe Khoziaistvo 1978:32-34.