Petrin, R. D. Steepness and types of steepness of structure curves according to volume of aggregates of forest stands of different categories and tree species. Pensoft Publishers.
Chicago Style (17th ed.) CitationPetrin, Rumen D. Steepness and Types of Steepness of Structure Curves According to Volume of Aggregates of Forest Stands of Different Categories and Tree Species. Pensoft Publishers.
MLA (9th ed.) CitationPetrin, Rumen D. Steepness and Types of Steepness of Structure Curves According to Volume of Aggregates of Forest Stands of Different Categories and Tree Species. Pensoft Publishers.
Warning: These citations may not always be 100% accurate.