BibTeX

@ARTICLE{iumj21080,
    author = "Charles Friedman",
     title = "Semigroup Product Formulas, Compressions, and Continual Observations in Quantum Mechanics",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 21,
      year = 1972,
     issue = 11,
     pages = "1001--1011",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj21080}{article}{
     author = {Friedman, Charles},
      title = {Semigroup Product Formulas, Compressions, and Continual Observations in Quantum Mechanics},
    journal = {Indiana Univ. Math. J.},
     volume = {21},
       year = {1972},
     number = {11},
      pages = {1001 \ndash 1011},
}