Bing found the following results
Invasion of Sumatra - Wikipedia
Japanese occupation of the Dutch East Indies - Wikipedia
Battle of Palembang - Wikipedia
Japanese occupation of the Dutch East Indies | Map and Timeline
Japanese Occupation of the Dutch East Indies – DW – 08/15/2007 - dw…
WW II: Sumatra a Key Victory for Japanese | RealClearHistory
Dutch East Indies Campaign, Sumatra | World War II Database
Women POWs of Sumatra (1942–1945) | Encyclopedia.com
World War II and the Japanese Occupation, 1942–5 - Springer
World War II ended 70 years ago - The Conversation