PREREQUISITES AND THE POSSIBILITY OF OBTAINING A 2-FOLD CROP OF POTATO MINITUBERS IN A GREENHOUSEPREREQUISITES AND THE POSSIBILITY OF OBTAINING 
A 2-FOLD CROP OF POTATO MINITUBERS IN 
A GREENHOUSE
 A local construction of Riemannian metricA local construction of 
a Riemannian metric on 
a smooth manifold is given by the following theorem.
 Identification of glucofrangulin A in Rhamnus frangula L. by 1H NMR spectroscopyIdentification of glucofrangulin 
A in 
Rhamnus frangula L. by 1H NMR spectroscopy