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11 “..., Holland, Italy, and other countries, and was the principal speaker at an N. S. F. Regional Conference...”

12 “... at Case Western Reserve University in May 1992. The principal speaker at the conference was Professor V. E...”

13 “... several talks by the principal speakers as well as contributed sessions. Altogether, there were ninety...”

14 “...This volume contains the lecture notes written by the four principal speakers at the C.I.M.E...”

15 “...This volume contains the presentations of the principal speakers at the NATO Advanced Study...”

16 “... on Partially Ordered Sets and Lattice Theory was held in Monterey, U.S.A. Among the principal speakers...”

17 “... contributions from most of the principal speakers and from many of the other participants, as well as some...”

18 “.... Each session (day) saw two principal speakers expounding the different views; the session chairmen were...”

19 “... to research articles contributed by participants, the volume includes invited expository articles by principal...”

20 “... the principal speakers and the invited special lecturers. The main subjects of our Advanced Study Institute...”