Logic Masters Deutschland e.V.

Ugh! putting digits in puzzles is hard. I started entering in the digits for this quadruples puzzle but got really tired... can you fill them in for me? let's say, uh, that the digits in each quadruples clue sum to the same total.

SudokuPad link (via tinyURL)
F-puzzles link

Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.
Quads: Circles with numbers inside indicate that one of the adjacent cells contains that digit. Digits adjacent to the same circle do not repeat;
The sum of all cells adjacent to each circle is the same for every circle.