MUMBAI, April 1 (Reuters) - Indian currency and bond markets are closed for trade on Thursday for annual book closing of banks and will be shut for Good Friday the following day. * Dollar climbs vs yen after early slip * Euro slips to 3-week low vs dollar, stung by Greece woes * EU summit next week to focus on possible Greek aid (For more stories on the Japanese economy click [ID:nECONJP ])