improving weak precedence

The weak precedence parsing technique for context-free grammars is
usually defined with the following restrictions:

1) empty rules are forbidden, and

2) somehow strong conditions are put on the similarity of right-hand
parts of grammar rules.

I am particularly interested in knowing about techniques that improve
weak precedence's parsing power by relaxing these two restrictions.

References are most welcome.

Jose Fortes
Laboratoire I3S
Sophia Antipolis
France
e-mail: fortes@mimosa.unice.fr
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