EBSEES: 3 hits for Lithuania / Intelligence Service, Secret Service

The European Bibliography of Slavic and East European Studies (EBSEES) collects books, journal articles, reviews and dissertations from Eastern Europe (former countries of Eastern Bloc) which were published in Belgium, Germany, Finland, France, Great Britain, the Netherlands, Austria and Switzerland from 1991 to 2007. The segment "Literature" and "Culture" of the European Bibliography of Slavic and East European Studies contains 18.000 bibliographic entries (from the total asset of 85.000). More information can be found here.

Your search for Lithuania / Intelligence Service, Secret Service provides 3 hits
1	Z dziejów polskiego wywiadu na Litwie w czasie II Wojny Światowej (Polish intelligence activities in Lithuania during World War II) Mackiewicz, Ryszard; Steckiewicz, Stanisław, in: Mars, 6, 1998, p. 167-76
2	Litewska okupacja Wileńszczyzny (27 października 1939 - 15 czerwca 1940). Sauguma w walce z polskim państwem podziemnym" (Lithuanian occupation of the Vilnius region, 29 October 1939-15 June 1940. The Lithunaian security police in the struggle with the Polish underground) Wołkonowski, Jarosław, in: Mars, 3, 1995, p. 51-74
3	The archives of the Lithuanian KGB Misiunas, Romuald J., Köln, Bundesinst. für Ostwiss. und Internat. Studien, 1994, 47 p.

The European Bibliography of Slavic and East European Studies (EBSEES) - 1991-2007

Z dziejów polskiego wywiadu na Litwie w czasie II Wojny Światowej (Polish intelligence activities in Lithuania during World War II)

Litewska okupacja Wileńszczyzny (27 października 1939 - 15 czerwca 1940). Sauguma w walce z polskim państwem podziemnym" (Lithuanian occupation of the Vilnius region, 29 October 1939-15 June 1940. The Lithunaian security police in the struggle with the Polish underground)

The archives of the Lithuanian KGB