Grulha Jr., Nivaldo Góes <br/><br/>
One Poincaré-Hopf type formula for determinantal surfaces and three-varieties with isolated singularities/ 
Nivaldo Góes Grulha Júnior. 
 - Rio de Janeiro:  IMPA,  2020. 
 - video online 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Matematica.