of Opusculum
Source: Webster's dictionaryInnocent XI was hostile towards the book "Varia Opuscula Theologica" (Various Theological Brochures) that the Spanish Jesuit Francisco Suárez published. Source: Internet
In his Opuscula, Alhazen considers the solution of a system of congruences, and gives two general methods of solution. Source: Internet
Two other works by him were De Pulsus Variatione (1685), and Ars explorandi medicas facultates plantarum ex solo sapore (1688); his Opuscula were collected in 1687. Source: Internet