R. W. Quackenbush:
Non-modular varieties of semimodular lattices with a spanning M3.
193-205
Alain Quilliot:
Representation theorems for graphs whose the vertex set is partially ordered.
207-219
Denis Richard:
All arithmetical sets of powers of primes are first-order definable in terms of the successor function and the coprimeness predicate.
221-247