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Zauralov, O. and O. Pavlinova. 1975. Transport and transformation of carbohydrates in nectary with respect to secretory function. Fiziol. Rast. Mosk. 22:500-507.

Zauralov, O. and R. Zauralov. 1970. Colloid-chemical properties of nectary cells and secretion of nectar. Fiziol. Rast. 17:162-168.

Zelengur, N. 1970. Asclepias syriaca L., a promising essential oil plant. Rastitel. Resursy.
6:350-355.
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