"Methodological problems in the study of gold bracteates", E. Bakka, "Norwegian Archaeological Review", t. 1 (1968), s. 5-35; "Comments", M. P. Malmer, "Norwegian Archaeological Review", t. 1 (1968), s. 36-44; "Reply", E. Bakka, "Norwegian Archaeological Review", t. 1 (1968), s. 45-56; "Crucial problems in the discussion on gold bracteates", M. P. Malmer, "Norwegian Archaeological Review", t. 2 (1969), s. 102-106 : [recenzja]

Wiadomości Numizmatyczne, Tom 14, Numer 4 (54) (1970) s. 251-253
Hanna Kóčka-Krenz , M. P. Malmer (aut. dzieła rec.), E. Bakka (aut. dzieła rec.)