Dharma Wheel

1//i need relevant research articles on mahayana precepts.
2// emptiness-existence discussion in madhyamaka school and yogacara school

To Your second question, I presume that it means: naive realism versus anything more evolved as a view of existence?
That question or problem exists already in the Sravakayana or the Smaller vehicle Dharma. It doesn't appear in the Madhyamaka or Yogacara for the first time in Buddhist history.