Sachidananda, H. , Raghunandana, K. , Shivamurthy, B.. "Comparison of Meshing Stiffness of Altered Tooth Sum Spur Gear Tooth with Different Pressure Angles". World Academy of Science, Engineering and Technology, Open Science Index 110, International Journal of Mechanical and Mechatronics Engineering (2016), 10(2), 334 - 340.