Book,  Part, Title, Chapter, Can.

 1   2,   1,    3,   1, 256 |      vocations, for missionary and ecumenical questions, and for other
 2   2,   2,    0,   1, 337 |        Church in solemn form in an Ecumenical Council. ~§2 It exercises
 3   2,   2,    0,   1, 338 |         Pontiff alone to summon an Ecumenical Council, to preside over
 4   2,   2,    0,   1, 339 |     obligation to be present at an Ecumenical Council with a deliberative
 5   2,   2,    0,   1, 339 |     dignity, can be summoned to an Ecumenical Council by the supreme authority
 6   2,   2,    0,   1, 341 |           341 §1 The decrees of an Ecumenical Council do not oblige unless
 7   3,   0,    0,   0, 749 |            gathered together in an Ecumenical Council and exercising their
 8   3,   0,    0,   0, 755 |         direct among catholics the ecumenical movement, the purpose of
 9   3,   0,    5,   0, 833 | consultative vote, take part in an Ecumenical Council, a particular council,
10   6,   2,    2,   0, 1371|            Roman Pontiff, or by an Ecumenical Council, or obstinately
11   6,   2,    2,   0, 1372|            the Roman Pontiff to an Ecumenical Council or to the College
12   7,   5,    0,   0, 1732|           Pontiff himself or by an Ecumenical Council. ~