28.6 Chapter IX, Special forms of differential equations. Examples XVII. page 247

28.6.1 problem 1
28.6.2 problem 2
28.6.3 problem 3
28.6.4 problem 4
28.6.5 problem 5
28.6.6 problem 6
28.6.7 problem 7
28.6.8 problem 8
28.6.9 problem 9
28.6.10 problem 10
28.6.11 problem 11
28.6.12 problem 12
28.6.13 problem 15
28.6.14 problem 18
28.6.15 problem 19
28.6.16 problem 20
28.6.17 problem 21