ARGENTINE LEADER REBUFFS WORKERS
Pres Isabel Martinez de Peron denounces Peronist labor leaders on June 28 and calls for continued support of Govt and its econ austerity program, natl TV address; speech appears to put Peron adm on collision course with significant part of labor movment, which has been strong supporter of Govt; Peron permits immediate salary increases of 50% for all employes, with additional 30% by end of '75; offers no indication that she will submit to labor demands for resignations of Econ Min Celestino Rodrigo and Soc Welfare Min Jose Lopez Rega; Labor Min Richard Otera announces his resignation; Peronist bloc in Sen offers to support trade-union demands on salaries; labor leaders silent (M)