if you do not find Serva references why do not see the ones  has erased from PXE talk page see the history of that page see how  erased them calling them SPAM If you cannot find Serva references probably you are not really looking much  About how WP works please tell about me the criteria for including ERPXE or COBBLER or even EL TORITO where are the independent sources backing up those projects Lets say how things are  supports those projects here Thats it those projects have no other support than that