Providing for indeterminate sentencing for certain convicted sexually dangerous persons or sexual psychopathic personalities, providing for applicability and determination through a bifurcated trial, burden of proof to be on the state in both phases and standard to be beyond a reasonable doubt; specifying the minimum and maximum sentences, prohibiting stay; establishing a special review board to hear and consider petitions for release of persons serving the minimum period of incarceration, procedures, specifying certain criteria for release, requiring and providing for conditional release upon release from incarceration (mk)