On the 1969 draft of DIN 5035 : Interior lighting by artificial light /
Fischer, D.
Garston :  Building Research Station, 
1970.
Originally published as Zum Entwurf 1969 von DIN 5035 Innenraumbeleuchtung mit künstlichem Licht, in Lichttechnik, 1969, 21 (10), 111A-115A.