What is the month and year less than 106005 were sunk by aircraft and 61857 were sunk by warship or raider?
CREATE TABLE "references" (
  "month_year" text,
  "sunk_by_u_boat" real,
  "sunk_by_aircraft" real,
  "sunk_by_warship_or_raider" real,
  "sunk_by_mines" real,
  "german_submarines_lost" real
);
SELECT "month_year" FROM "references" WHERE "sunk_by_aircraft"<106005 AND "sunk_by_warship_or_raider"=61857;