This lack of a definitive source has meant that the treatises wich cover his fundamental work have been written by others. Recent directions which arise from Calderón's theories are described in .
Ang kakulangan ng isang tukoy na source ay sinadya na ang treatises na takip ng kanyang pangunahing trabaho ay isinulat ng iba. Recent direksyon kung saan arise mula sa Calderón's theories ay inilarawan sa.