VORSSELMAN DE HEER, P.O.C., Oratio de virium doctrina in physica disciplina rite adhibenda : dicta publice A.D. VII Novembris MDCCCXXXIV, cum matheseos, physices et philosophiae theoreticae professionem, in Illustri Daventriae Athenaeo, solenni ritu auspicaretur.
Daventriae (Deventer), J. de Lange, 1834, 45+(2)pp. Pieter Otto Coenraad Vorsselman de Heer (1809-1841) was a Dutch professor and soldier.