DR. MIN-CHUEH CHANG, 82, who co-developed the birth control pill and pioneered research making in vitro fertilization possible, died Wednesday in Worcester, Mass. He began work in 1951 at the Worcester Foundation for Experimental Biology on the effects of synthetic progestins on reproduction. The research, done with Dr. Gregory Pincus, a founder of the foundation, led to the development of the oral contraceptive in 1959. Dr. Chang also is credited with carrying out basic research in the 1950s into techniques that made it possible to fertilize a human egg with sperm outside the body, resulting in the births of so-called test tube babies. LARRY KERT, 60, who played Tony in the original Broadway production of West Side Story, died Wednesday in New York of complications of AIDS. He and Carol Lawrence played the star-crossed lovers doomed by gang warfare between white people and Puerto Ricans in the modern musical retelling of Romeo and Juliet that arrived at the Winter Garden Theater in 1957. Mr. Kert, with his soaring tenor, got to sing some of the best songs in the Leonard Bernstein-Stephen Sondheim score _ Maria, Tonight and Something's Coming.