Published in Philippine Journal of Science D, in 1915, in volume 9, pages 405-407

Published in Philippine Journal of Science D, in 1915, in volume 9, pages 457-464

Published in Philippine Journal of Science, in 1915, in volume 9, issue D, pages 531-533

Published in Philippine Journal of Science, in 1915, in volume 10, pages 49-58

Published in Philippine Journal of Science D, in 1915, in volume 10, pages 75-88

Published in Philippine Journal of Science D, in 1915, in volume 10, pages 365-405

Published in Philippine Journal of Science Manila Sect D, in 1915, in volume 10, issue 2, pages 89-109

Published in The Philippine journal of science, in 1915, in volume 10, issue 6, pages 317-343