Batista, C. (2014). Generalizing the Petrov Classification: On the pursuit of generalizations for the Petrov Classification and the Goldberg-Sachs Theorem (1a. ed.). Lambert Academic Publishing.
Chicago-čujuhus (17. p.)Batista, Carlos. Generalizing the Petrov Classification: On the Pursuit of Generalizations for the Petrov Classification and the Goldberg-Sachs Theorem. 1a. ed. Sarrebruck: Lambert Academic Publishing, 2014.
MLA-čujuhus (9. p.)Batista, Carlos. Generalizing the Petrov Classification: On the Pursuit of Generalizations for the Petrov Classification and the Goldberg-Sachs Theorem. 1a. ed. Lambert Academic Publishing, 2014.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.