DIN 11622-4
DIN 11622-4 Silage and liquid manure containers; part 4: design principles; above-ground silage and liquid manure steel containers
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/1994
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/1994