Visalyaputra, Shusee2012-02-132012-02-132006-08Visalyaputra Shusee. When is a labor painless. Siriraj Medical Journal, 2006 Aug; 58(8): 984-985.http://imsear.searo.who.int/handle/123456789/136953enWhen is a labor painless.Article