hi boh thanks for your prompt response i read through translation of your history of the oil tanker article and it's quite nice with respect to the oil tanker article i'm sure you understand that i have to edit everything that's added while it's in the good article review stage as for the number of citations i know that the english wikipedia is much more picky about citations than others the rule of thumb is not every statement in an article needs a citation but if in doubt provide one cheers talk