code: def get_level_nodes(self, level):
          
          
          level_nodes = [];
          if (level < self.__height):
              level_nodes = self.__recursive_get_level_nodes(level, self.__root);
          
          return level_nodes;
docs: !
          @brief Traverses CF-tree to obtain nodes at the specified level.
          
          @param[in] level (uint): CF-tree level from that nodes should be returned.
          
          @return (list) List of CF-nodes that are located on the specified level of the CF-tree.